Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9cc011d9b0f5502a…

MALICIOUS

Office (OLE)

23.5 KB Created: 2009-10-09 16:07:00
MD5: 421749a405275c84e02dfbc24283de18 SHA-1: 12a7b2f71a338e553e7fb2bb633cb8664581233c SHA-256: 9cc011d9b0f5502aaca0ea9943c171979e354a935164915352d81639ef7fa6ce
320 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is an OLE document containing VBA macros, specifically triggering a Document_Open macro that executes a Shell() command. This indicates the document is designed to run arbitrary code upon opening. The embedded 'macros.bas' file and the critical 'OLE_VBA_SHELL' heuristic confirm the execution of external commands. The document body presents a generic proposal template, suggesting a lure to trick users into enabling macros.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Trojan.Replog-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Replog-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 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
5b65961cce31dcaec1bad414d2555d2ad3cc8e4d7da7280e5a5cc3b1d567ed3e		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 834 bytes
Detection
ClamAV: Doc.Trojan.Replog-1
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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