Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4b003b5e74b95204…

MALICIOUS

Office (OOXML)

41.8 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: b467f35f4f91979971a473d66878cae2 SHA-1: 8c0019e3583b370f494f033eb9ea35e3bfe37c51 SHA-256: 4b003b5e74b952044f7cf3d06403ba22492e82ef2d4991d1610b54846bdd36e4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell 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 secondary payload. The specific obfuscation and lack of clear network 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
602f4da92508756ad19732350ea7e6f05c25e3b040c00b523102c5cca87b1643		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
c0b906b0f8503bbc5ccf4d9c52ce72c5203e91e2386538fb5c109940416cc753		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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