Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 167f75629393d903…

MALICIOUS

Office (OLE)

47.5 KB Created: 2002-05-28 10:42:00 Authoring application: Microsoft Word 8.0
MD5: 9e3606f3bc8cbac465afee0083de6893 SHA-1: d68111ab3caf2441f916df0343993baa8c577e5e SHA-256: 167f75629393d903f4ba7f87be22e5297f001ba17816ff656ca2eed12954b246
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing VBA macros. The 'Document_Open' macro is designed to execute a shell command, likely to download and run a secondary payload. This is further supported by ClamAV detections indicating it is a trojan. The document body itself is a lure, impersonating a tax notification to encourage the user to open it.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Trojan.Marker-31 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Marker-31
  • 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 p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • 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
4c09c46c924e80a87c891f5ff3937242b4ae96b924888c0e04cf00276342ad2f		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 29740 bytes
Detection
ClamAV: Doc.Trojan.Eight941-1
Obfuscation or payload: unlikely

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