Detects Shamoon 2.0 Communication Components

Hunt Hypothesis

This hunt targets adversaries deploying Shamoon 2.0 communication modules to establish persistent command-and-control channels and exfiltrate sensitive data within Azure environments. Proactively hunting for these specific components is critical because early identification of their unique network signatures allows the SOC team to isolate compromised assets before the malware executes its destructive payload or spreads laterally across the cloud infrastructure.

YARA Rule

rule Shamoon2_ComComp {
   meta:
      description = "Detects Shamoon 2.0 Communication Components"
      author = "Florian Roth (with Binar.ly)"
      reference = "https://goo.gl/jKIfGB"
      date = "2016-12-01"
      score = 70
      hash1 = "61c1c8fc8b268127751ac565ed4abd6bdab8d2d0f2ff6074291b2d54b0228842"
   strings:
      $s1 = "mkdir %s%s > nul 2>&1" fullword ascii
      $s2 = "p[%s%s%d.%s" fullword ascii

      $op1 = { 04 32 cb 88 04 37 88 4c 37 01 88 54 37 02 83 c6 }
      $op2 = { c8 02 d2 c0 e9 06 02 d2 24 3f 02 d1 88 45 fb 8d }
      $op3 = { 0c 3b 40 8d 4e 01 47 3b c1 7c d8 83 fe 03 7d 1c }
   condition:
      uint16(0) == 0x5a4d and filesize < 500KB and ( all of ($s*) or all of ($op*) )
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

• Microsoft Defender for Endpoint — Custom indicators / advanced hunting
• Email Gateway — Attachment scanning
• File Share Monitoring — Periodic scanning of shared drives
• YARA CLI — Manual threat hunting on endpoints

This rule contains 5 string patterns in its detection logic.

References

• https://goo.gl/jKIfGB
• Source Rule

False Positive Guidance

Here are four specific false positive scenarios for the Detects Shamoon 2.0 Communication Components rule, tailored for an enterprise environment:

• Enterprise Endpoint Management Agent Updates

  • Scenario: The deployment of a new agent version or policy update by tools like Microsoft Intune, Ivanti Neurons, or SolarWinds NPM. These agents often establish persistent background connections to management servers using specific ports and protocols that mimic the C2 (Command & Control) handshake patterns of Shamoon 2.0, particularly when negotiating certificate chains or downloading large configuration blobs.
  • Filter/Exclusion: Create an exclusion for traffic originating from known Endpoint Management server subnets (e.g., 10.50.x.x) and destination ports associated with the specific vendor’s update service (e.g., TCP 443 to *.intune.microsoft.com or *.solarwinds.com). Additionally, exclude processes running under the specific service accounts used by these agents (e.g., NT SERVICE\IntuneAgent).

• Scheduled Antivirus Definition Synchronization

  • Scenario: Automated daily synchronization jobs for enterprise antivirus solutions such as Symantec Endpoint Protection, CrowdStrike Falcon, or Trend Micro. These tools frequently initiate outbound connections to their respective cloud repositories to fetch virus definition updates. The traffic volume and the specific TLS handshake characteristics of these update cycles can trigger the Shamoon 2.0 communication signature, especially if the rule looks for high-frequency small packet exchanges typical of botnet coordination.
  • Filter/Exclusion: Implement a time-based filter to suppress alerts during known maintenance windows (e.g., 01:00–04:00 UTC). Furthermore, add an exclusion for processes named Symantec Antivirus, CrowdStrike Falcon Sensor (`C:\Program Files\Crowd