Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 7d90e35146c5cc1c…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: a74d8b86046bc4357b88340dfd298c67 SHA-1: eb6498fdf899c97cde3bbdebbce249b5eead1266 SHA-256: 7d90e35146c5cc1cfc700d80efa87ceabb4ce93cf97bc38152397597c41ac078
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The file is an OOXML document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA macro itself appears to be heavily obfuscated, but its presence and the associated heuristics strongly suggest it's designed to download and execute a second-stage payload. The lack of specific indicators for a known family leads to an 'unknown family' classification.

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
a004a3ae95fae510c19e86f1adeaa7789847415502669d8b9adda1136d04032b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
7423dcd4bf9cdede36a22a4b4e09b938c31e06a1ea5f420a8d7329b1cbe2a044		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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