Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d64622cf5ae791c6…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 9d46621e6df851a5ef1ff73a352df2e6 SHA-1: 65f9e0276f0c84053fab4ae1cd6ad7646d4921da SHA-256: d64622cf5ae791c6fb4733c1e912a145282aac45a1df1b7e52829cbd899c21f7
160 Risk Score

Malware Insights

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

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 associated heuristics strongly suggest it's designed to download and execute a second-stage payload. The specific obfuscation and lack of clear indicators 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
966f2051288bad4ae0510d46c336d60a65b080d3aa6ab0a2085eb92ef9c04f77		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
1199291ea565648f52be66b0ed42ff64425519e5ace35b9811bf60a95a48dea1		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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