user@threatcheck.sh ~ threat-analysis
bash
$ analyze-threat Trojan:Linux/SAgnt.S!MTB
Trojan:Linux/SAgnt.S!MTB - Windows Defender threat signature analysis

Trojan:Linux/SAgnt.S!MTB - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Trojan:Linux/SAgnt.S!MTB
Classification:
Type:Trojan
Platform:Linux
Family:SAgnt
Detection Type:Concrete
Known malware family with identified signatures
Variant:S
Specific signature variant within the malware family
Suffix:!MTB
Detected via machine learning and behavioral analysis
Detection Method:Behavioral
Confidence:Very High
False-Positive Risk:Low

Concrete signature match: Trojan - Appears legitimate but performs malicious actions for Linux platform, family SAgnt

Summary:

This is a concrete detection of Trojan:Linux/SAgnt.S!MTB, a sophisticated Linux-based Trojan. It exhibits capabilities indicative of a multi-platform threat, containing strings associated with Windows-specific attack techniques such as abusing legitimate binaries (mshta, regsvr32, rundll32, bitsadmin, schtasks, PowerShell), Windows API hooking for monitoring (WH_MOUSE, WH_SHELL), and data encoding, suggesting it can deploy or manage Windows-targeting payloads or act as a C2 component.

Severity:
Critical
VDM Static Detection:
Relevant strings associated with this threat:
 - !#HSTR:IntentBase64 (PEHSTR_EXT)
 - ToBase64String (PEHSTR_EXT)
 - !#HSTR:StringCodeForMshta.A!pli (PEHSTR_EXT)
 - mshta (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.C!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.D!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.L!pli (PEHSTR_EXT)
 - WH_MOUSE (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.O!pli (PEHSTR_EXT)
 - WH_SHELL (PEHSTR_EXT)
 - !#HSTR:StringCodeForRegsvr32.A!pli (PEHSTR_EXT)
 - regsvr32 (PEHSTR_EXT)
 - !#HSTR:StringCodeForRundll32.A!pli (PEHSTR_EXT)
 - rundll32 (PEHSTR_EXT)
 - !#HSTR:StringCodeForBITSJobs.A!pli (PEHSTR_EXT)
 - bitsadmin (PEHSTR_EXT)
 - !#HSTR:StringCodeForPowerShell.G!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForScheduledTask.A!pli (PEHSTR_EXT)
 - shch (PEHSTR_EXT)
 - !#HSTR:StringCodeForDataEncoding.D!pli (PEHSTR_EXT)
YARA Rule:
rule Trojan_Linux_SAgnt_S_2147935645_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Trojan:Linux/SAgnt.S!MTB"
        threat_id = "2147935645"
        type = "Trojan"
        platform = "Linux: Linux platform"
        family = "SAgnt"
        severity = "Critical"
        info = "MTB: Microsoft Threat Behavior"
        signature_type = "SIGNATURE_TYPE_ELFHSTR_EXT"
        threshold = "3"
        strings_accuracy = "High"
    strings:
        $x_1_1 = {31 c9 ba 00 10 00 00 48 89 ee 89 df e8 08 fd ff ff 85 c0 48 89 c2 89 c1 7e 21 48 89 e8 80 30 99 48 ff c0 89 c6 29 ee 39 ce 7c f2 48 63 d2 48 89 ee 44 89 ef}  //weight: 1, accuracy: High
        $x_1_2 = {31 c0 b9 00 04 00 00 48 89 ef f3 ab 89 df e8 1b fd ff ff 49 8b 3c 24 48 8d b4 24 30 08 00 00 31 c0 e8 78 fd ff ff 48 8d b4 24 30 08 00 00 ba 01 00 00 00 bf 52 0e 40 00 31 c0 e8 bf fc ff ff 48 8b 15 d8 06 20 00 48 8d 74 24 10 44 89 ef 31 c0 48 c7 44 24 10 56 0e 40 00 48 c7 44 24 18 00 00 00 00 e8 07 fd ff ff 89 df e8 c0 fc ff ff 48 81 c4 38 1c 00 00 31 c0 5b 5d 41 5c 41 5d c3}  //weight: 1, accuracy: High
        $x_1_3 = {66 44 8b 4c 24 22 41 b8 c5 0d 40 00 66 41 c1 c9 08 45 0f b7 c9 48 89 ef b9 a4 0d 40 00 41 51 68 a4 0d 40 00 ba c9 0d 40 00 be cd 0d 40 00 31 c0 e8 a7 fe ff ff 31 c9 ba 00 04 00 00 48 89 ee 89 df e8 f6 fd ff ff 31 c0 48 89 ef b9 00 01 00 00 f3 ab 31 ed 58}  //weight: 1, accuracy: High
    condition:
        (filesize < 20MB) and
        (all of ($x*))
}
Known malware which is associated with this threat:
Filename: 91cca9db00070f0ae92ae8bc14306b10fbd54e1bd5fe785c0e62cfecd92afa1f
91cca9db00070f0ae92ae8bc14306b10fbd54e1bd5fe785c0e62cfecd92afa1f
13/12/2025
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the affected Linux system to prevent further compromise. Conduct a thorough forensic analysis to determine the initial compromise vector and scope of the attack, identifying any deployed Windows payloads or impacted Windows systems. Eradicate the malicious file, restore from clean backups if necessary, and ensure all systems are fully patched and hardened with up-to-date security software.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 13/12/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
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