Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7b0240508d6be1ea…

MALICIOUS

Office (OLE)

33.0 KB Created: 2008-03-13 15:16:00 Authoring application: Microsoft Word 9.0
MD5: 09d2d3cb3da42a5f112af10732c68c1a SHA-1: aaf18f8305bd33e99dbcf1b6cadade485cfb0363 SHA-256: 7b0240508d6be1ea87533c1b0dd83a76e1de3a39e124029b19524e45b941a76e
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing VBA macros. The `Document_Open` macro is present and triggers the execution of `GOODSub` and `RELAX2`. The `RELAX2` subroutine conditionally writes a batch script to `C:\Autoexec.bat` that contains destructive commands, aiming to delete all files on the C: drive. The presence of the `Document_Open` macro and the destructive nature of the script strongly indicate malicious intent, likely delivered via spearphishing.

Heuristics 4

  • ClamAV: Doc.Trojan.Xaler-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Xaler-1
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
31cc3a5f1eb258e3998f09ee4b1a8312aa66f8f7c995c84559dfff466739e7e2		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2713 bytes
Detection
ClamAV: Doc.Trojan.Xaler-1
Obfuscation or payload: unlikely

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