Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 61373a96d97a9bc0…

MALICIOUS

Office (OLE)

1.32 MB Created: 2010-05-18 19:36:00 Authoring application: Microsoft Word 10.0
MD5: 8760f2a71818097ea4621858ce618e54 SHA-1: 15c2e659dd281926b83107d7b88742c3776054ab SHA-256: 61373a96d97a9bc081b72f413844abacd1ad0184c13e87f4b8f2568be8494f2f
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The sample contains VBA macros, including an Auto_Open macro, which are designed to establish persistence. Specifically, the `auto_open` subroutine copies the workbook to the Excel startup path as 'StartUp.xls'. The script also sets up various `OnKey` and `OnSheetActivate` events to trigger further execution chains, likely to maintain persistence or execute secondary payloads. The ClamAV detections (Ppt.Malware.Laroux-10036124-0 and Xls.Trojan.Escape-1) further indicate malicious intent.

Heuristics 5

  • ClamAV: Ppt.Malware.Laroux-10036124-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Ppt.Malware.Laroux-10036124-0
  • 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.
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • 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
fb2929454da53a7c274256eb0b38ca9476f9f1c61d52f3b7e15bf6ac20b85c3e		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2073 bytes
Detection
ClamAV: Xls.Trojan.Escape-1
Obfuscation or payload: unlikely

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