Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 7fb4bdf4c989f748…

MALICIOUS

Office (OLE) / .XLS

15.0 KB Created: 2010-05-19 09:31:57 Authoring application: Microsoft Excel
MD5: ed888af2956db362581cc30c2cb3032a SHA-1: 4367baf6942f899110a189106962f234cb032e24 SHA-256: 7fb4bdf4c989f748003789f7a3abc457528d91f0ee2d89e5cbfe1a24a8e35cd2
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. This macro attempts to copy itself to the Excel startup directory as 'StartUp.xls', thereby establishing persistence. It also configures keyboard shortcuts to trigger its 'escape' subroutine, which further manipulates the Excel environment. The presence of Auto_Open and the self-copying behavior strongly suggest a malicious intent to maintain presence on the system.

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
df0db2b736b6c198afb0d1338be15f877e7b5ce9ad88e18698ac06d145dfcb65		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1988 bytes
Detection
ClamAV: Xls.Trojan.Escape-1
Obfuscation or payload: unlikely

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