Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 11ce813d85ea70aa…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: e0be7bdff3ceb8d02f1c69b7e410e016 SHA-1: 8aae9d93f599a9d815ea92d2b7e5e48539c2fa6c SHA-256: 11ce813d85ea70aae178d9b25283a0efa4acad592c79cb1bbb46892bfce230d8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is an Office document containing VBA macros. Heuristics indicate the presence of PowerShell and cmd.exe references within the VBA code, along with a GetObject call. The VBA macro itself appears to be a Base64 decoder, suggesting it's used to obfuscate and execute a payload. This points to a macro-based downloader pattern.

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
826dc1bf1d0e0675aeca21c159c55391eb1a651b3d5fdc6f330e0083b0ac351f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
d539e0bd6561e3ceb99d70cf61c9f5fc1ccea5e667f6536d43a3a1146f4bd742		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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