Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c526e6330f577138…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 358886af1d2c5081b62f287b37f74846 SHA-1: b866a4ad61995dd1717c93d4dd8209fae21de422 SHA-256: c526e6330f57713815f2de87a10d2d55c2a23ea99cf9d3744e39090ab62e0aab
160 Risk Score

Malware Insights

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

The OOXML document contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of a Base64 decoding function suggest that the macro is designed to download and execute 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
78b4812f0d4dea8e4cd9349f33f0b49356d9985faca11e0b2d08cdaf3b5a4752		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
5e4f0c0e88906cf073ad07db75202f7b212694e4d57962c790787f128535b3c2		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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