Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c621cb34ca498e91…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 4af6592c7151462c0a68942df4b4c6db SHA-1: c00d96724421ac3d94a15b171ce9bbf1a98ea682 SHA-256: c621cb34ca498e91fe886e2c83a3c78c1e3853901f3074d381d7c4ed3692c448
160 Risk Score

Malware Insights

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

The OOXML file 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 secondary 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
d06d8591b1371e6b3d86e0db53eabdc1d76575969d74cefc5025b4a15bdae31d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
c1179cb3c7e43976c9ca4c639dd3157fe269278a26942dc5714e7eca495d2f47		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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