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moved decode-spam-headers to a separate folder.

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- **`decode-spam-headers.py`** - This tool accepts on input an `*.EML` or `*.txt` file with all the SMTP headers. It will then extract a subset of interesting headers and using **79+** tests will attempt to decode them as much as possible.
This script also extracts all IPv4 addresses and domain names and performs full DNS resolution of them.
Resulting output will contain useful information on why this e-mail might have been blocked.
Processed headers (more than **67+** headers are parsed):

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## `decode-spam-headers.py`**
This tool accepts on input an `*.EML` or `*.txt` file with all the SMTP headers. It will then extract a subset of interesting headers and using **79+** tests will attempt to decode them as much as possible.
This script also extracts all IPv4 addresses and domain names and performs full DNS resolution of them.
Resulting output will contain useful information on why this e-mail might have been blocked.
Processed headers (more than **67+** headers are parsed):
- `X-forefront-antispam-report`
- `X-exchange-antispam`
- `X-exchange-antispam-mailbox-delivery`
- `X-exchange-antispam-message-info`
- `X-microsoft-antispam-report-cfa-test`
- `Received`
- `From`
- `To`
- `Subject`
- `Thread-topic`
- `Received-spf`
- `X-mailer`
- `X-originating-ip`
- `User-agent`
- `X-forefront-antispam-report`
- `X-microsoft-antispam-mailbox-delivery`
- `X-microsoft-antispam`
- `X-exchange-antispam-report-cfa-test`
- `X-spam-status`
- `X-spam-level`
- `X-spam-flag`
- `X-spam-report`
- `X-vr-spamcause`
- `X-ovh-spam-reason`
- `X-vr-spamscore`
- `X-virus-scanned`
- `X-spam-checker-version`
- `X-ironport-av`
- `X-ironport-anti-spam-filtered`
- `X-ironport-anti-spam-result`
- `X-mimecast-spam-score`
- `Spamdiagnosticmetadata`
- `X-ms-exchange-atpmessageproperties`
- `X-msfbl`
- `X-ms-exchange-transport-endtoendlatency`
- `X-ms-oob-tlc-oobclassifiers`
- `X-ip-spam-verdict`
- `X-amp-result`
- `X-ironport-remoteip`
- `X-ironport-reputation`
- `X-sbrs`
- `X-ironport-sendergroup`
- `X-policy`
- `X-ironport-mailflowpolicy`
- `X-remote-ip`
- `X-sea-spam`
- `X-fireeye`
- `X-antiabuse`
- `X-tmase-version`
- `X-tm-as-product-ver`
- `X-tm-as-result`
- `X-imss-scan-details`
- `X-tm-as-user-approved-sender`
- `X-tm-as-user-blocked-sender`
- `X-tmase-result`
- `X-tmase-snap-result`
- `X-imss-dkim-white-list`
- `X-tm-as-result-xfilter`
- `X-tm-as-smtp`
- `X-scanned-by`
- `X-mimecast-spam-signature`
- `X-mimecast-bulk-signature`
- `X-sender-ip`
- `X-forefront-antispam-report-untrusted`
- `X-microsoft-antispam-untrusted`
- `X-sophos-senderhistory`
- `X-sophos-rescan`
Most of these headers are not fully documented, therefore the script is unable to pinpoint all the details, but at least it collects all I could find on them.
### Usage
Help:
```
PS> py .\decode-spam-headers.py --help
usage: decode-spam-headers.py [options] <file>
optional arguments:
-h, --help show this help message and exit
Required arguments:
infile Input file to be analysed
Options:
-o OUTFILE, --outfile OUTFILE
Output file with report
-f {json,text}, --format {json,text}
Analysis report format. JSON, text. Default: text
-N, --nocolor Dont use colors in text output.
-v, --verbose Verbose mode.
-d, --debug Debug mode.
Tests:
-r, --resolve Resolve IPv4 addresses / Domain names.
-a, --decode-all Decode all =?us-ascii?Q? mail encoded messages and print their contents.
```
### Example screenshots
![1.png](img/1.png)
![2.png](img/2.png)
![3.png](img/3.png)
![4.png](img/4.png)
### Sample run
Sample run:
```
PS> py decode-spam-headers.py headers.txt
------------------------------------------
(1) Test: Received - Mail Servers Flow
HEADER:
Received
VALUE:
...
ANALYSIS:
- List of server hops used to deliver message:
--> (1) "attacker" <attacker@attacker.com>
|_> (2) SMTP-SERVICE (44.55.66.77)
time: 01 Jan 2021 12:34:20
|_> (3) mail-wr1-f51.google.com (209.85.221.51)
time: 01 Jan 2021 12:34:20
version: fuzzy match: Exchange Server 2019 CU11; October 12, 2021; 15.2.986.9
|_> (4) SN1NAM02FT0061.eop-nam02.prod.protection.outlook.com (2603:10b6:806:131:cafe::e5)
time: 01 Jan 2021 12:34:20
version: fuzzy match: Exchange Server 2019 CU11; October 12, 2021; 15.2.986.9
|_> (5) SA0PR11CA0138.namprd11.prod.outlook.com (2603:10b6:806:131::23)
time: 01 Jan 2021 12:34:20
version: fuzzy match: Exchange Server 2019 CU11; October 12, 2021; 15.2.986.9
|_> (6) CP2PR80MB4114.lamprd80.prod.outlook.com (2603:10d6:102:3c::15)
time: 01 Jan 2021 12:34:23
|_> (7) "Victim Surname" <victim@contoso.com>
------------------------------------------
[...]
------------------------------------------
(4) Test: Mail Client Version
HEADER:
X-Mailer
VALUE:
OEM
ANALYSIS:
- X-Mailer header was present and contained value: "OEM".
------------------------------------------
(5) Test: X-Forefront-Antispam-Report
HEADER:
X-Forefront-Antispam-Report
VALUE:
CIP:209.85.167.100;CTRY:US;LANG:de;SCL:5;SRV:;IPV:NLI;SFV:SPM;H:mail-lf1-f100.google.com;PTR:mail-l
f1-f100.google.com;CAT:DIMP;SFTY:9.19;SFS:(4636009)(956004)(166002)(6916009)(356005)(336012)(19
625305002)(22186003)(5660300002)(4744005)(6666004)(35100500006)(82960400001)(26005)(7596003)(7636003)(554460
02)(224303003)(1096003)(58800400005)(86362001)(9686003)(43540500002);DIR:INB;SFTY:9.19;
ANALYSIS:
- Microsoft Office365/Exchange ForeFront Anti-Spam report
- CIP: Connecting IP address: 209.85.167.100
- CTRY: The source country as determined by the connecting IP address
- US
- LANG: The language in which the message was written
- de
- IPV: Ingress Peer Verification status
- NLI: The IP address was not found on any IP reputation list.
- SFV: Message Filtering
- SPM: The message was marked as spam by spam filtering.
- H: The HELO or EHLO string of the connecting email server.
- mail-lf1-f100.google.com
- PTR: Reverse DNS of the Connecting IP peer's address
- mail-lf1-f100.google.com
- CAT: The category of protection policy
- DIMP: Domain Impersonation
- SFTY: The message was identified as phishing
- 9.19: Domain impersonation. The sending domain is attempting to impersonate a protected domain
- DIR: Direction of email verification
- INB: Inbound email verification
- Message matched 24 Anti-Spam rules (SFS):
- (1096003)
- (166002)
- (19625305002)
- (22186003)
- (224303003)
- (26005)
- (336012)
- (356005)
- (35100500006) - (SPAM) Message contained embedded image.
- (43540500002)
- (4636009)
- (4744005)
- (55446002)
- (5660300002)
- (58800400005)
- (6666004)
- (6916009)
- (7596003)
- (7636003)
- (82960400001)
- (86362001)
- (956004)
- (9686003)
- SCL: Spam Confidence Level: 5
- SPAM: Spam filtering marked the message as Spam
More information:
- https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/anti-spam-message-headers
- https://docs.microsoft.com/en-us/exchange/antispam-and-antimalware/antispam-protection/antispam-stamps
- https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/spam-confidence-levels
- https://docs.microsoft.com/en-us/exchange/monitoring/trace-an-email-message/run-a-message-trace-and-view-results
------------------------------------------
(6) Test: X-Microsoft-Antispam-Mailbox-Delivery
HEADER:
X-Microsoft-Antispam-Mailbox-Delivery
VALUE:
ucf:0;jmr:1;auth:0;dest:J;ENG:(910001)(944506458)(944626604)(750132)(520011016);
ANALYSIS:
- This header denotes what to do with received message, where to put it.
- auth: Message originating from Authenticated sender
- 0: Not Authenticated
- dest: Destination where message should be placed
- J: JUNK directory
- Message matched 6 Anti-Spam Delivery rules:
- (520011016)
- (750132)
- (910001)
- (944506458)
- (944626604)
------------------------------------------
(7) Test: X-Microsoft-Antispam Bulk Mail
HEADER:
X-Microsoft-Antispam
VALUE:
BCL:0;
ANALYSIS:
- BCL: BULK Confidence Level: 0
The message isn't from a bulk sender.
More information:
- https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/bulk-complaint-level-values
------------------------------------------
[...]
------------------------------------------
(10) Test: MS Defender ATP Message Properties
HEADER:
X-MS-Exchange-AtpMessageProperties
VALUE:
SA|SL
ANALYSIS:
- MS Defender Advanced Threat Protection enabled following protections on this message:
- Safe Attachments Protection
- Safe Links Protection
------------------------------------------
(11) Test: Domain Impersonation
HEADER:
From
VALUE:
"attacker" <attacker@attacker.com>
ANALYSIS:
- Mail From: <attacker@attacker.com>
- Mail Domain: attacker.com
--> resolves to: 11.22.33.44
--> reverse-DNS resolves to: ec2-11-22-33-44.eu-west-3.compute.amazonaws.com
(sender's domain: amazonaws.com)
- First Hop: SMTP-SERVICE (44.55.66.77)
--> resolves to:
--> reverse-DNS resolves to: host44-55-66-77.static.arubacloud.pl
(first hop's domain: arubacloud.pl)
- Domain SPF: "v=spf1 include:_spf.google.com ~all"
- WARNING! Potential Domain Impersonation!
- Mail's domain should resolve to: amazonaws.com
- But instead first hop resolved to: arubacloud.pl
```

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