Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7ec7549e7548527b…

MALICIOUS

Office (OLE)

15.5 KB Created: 2003-07-13 09:54:29 Authoring application: Microsoft Excel
MD5: 7134ce82870fd234015985c5588a0158 SHA-1: 43cd9368369a9ffca5f27365860a7e0969661188 SHA-256: 7ec7549e7548527be11777d1e24ad243bcbc8e4529498074494d3c11d248f531
180 Risk Score

Malware Insights

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

The sample is an Excel file containing VBA macros, specifically an Auto_Open macro designed to copy itself to the Excel startup directory as 'StartUp.xls'. This action aims to establish persistence. The script also manipulates sheet activation and key bindings, likely to evade detection or maintain control. While the specific payload is not evident, the persistence mechanism is clear.

Heuristics 4

  • ClamAV: Xls.Trojan.Escape-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Trojan.Escape-2
  • 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
  • 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
b1dc6e799f600e1fe03c12ee5c927d9c20e72385747b65f9e697c96da1cbf849		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1767 bytes
Detection
ClamAV: Xls.Trojan.Escape-1
Obfuscation or payload: unlikely

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