Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 1ceaab14c75a27c2…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: f6c947f459ed26c1e0f870b8264c3c6c SHA-1: b34fe7730ef32246def49734b528dfe3082e12f0 SHA-256: 1ceaab14c75a27c2dc11e1f350e0dfdb2954a328c38238cbb168561e3b1905d5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The file is an OOXML document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA code itself appears to be heavily obfuscated, but the presence of these indicators suggests it is designed to execute further commands, likely downloading and running a second-stage payload. The specific obfuscation and lack of clear URLs prevent definitive family attribution.

Heuristics 4

  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
95112fab75d82e616d720188fea8bcbfa3d3639b0b9e3f4e55e3120cabfde11f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
875ee75f8e967f1289e09f8605fd7f17e44b0f2281e3e324ea9928ad5af8e54d		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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