Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b96b986dcec1dfc7…

MALICIOUS

Office (OOXML)

41.8 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 5572864c571d860418392ba634cd4115 SHA-1: 90b98f354ef08239670174585973e3449940666a SHA-256: b96b986dcec1dfc721f1b45fdc9535fc74b93bed00d8dafe51a5ae847a71a6e4
160 Risk Score

Malware Insights

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

The file is an Office 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 references to external command execution suggest it's designed to download and run a second-stage payload. The specific obfuscation and lack of clear URLs prevent a more precise 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
29c9818a0fbe2f9feb2066f47b1ca5d61c7bba1a0890ef9d0f9e7500c4b2df13		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
e9c67c5160a586c14c1ee404e48e1ddd64aacf524ca95e7ca1d1e0f6a43d86ed		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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