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

Static analysis result for SHA-256 14557b8fdcd939e3…

MALICIOUS

Office (OLE) / .XLS

53.5 KB Created: 1997-01-14 01:50:29 Authoring application: Microsoft Excel
MD5: acbbe16a41c7e5b0f56745e4da1615ba SHA-1: 75bbe3fc68e6adbc261a960956af47fd4a49b4bf SHA-256: 14557b8fdcd939e3f0ff2763e11268a1a9e14ceb5bbe29c7504641da2a420b84
180 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing a VBA macro with an Auto_Open subroutine. This macro attempts to copy itself to the Excel startup directory as 'StartUp.xls', indicating a persistence mechanism. The macro also manipulates application event handlers, suggesting it aims to execute further malicious actions. The ClamAV detection further supports its malicious nature.

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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