Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 81a149f1b2364aac…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 1ea85659bc48952f535b0e623083a663 SHA-1: dd06679981c07eeaeaba24d68f63b3ad6bf8a571 SHA-256: 81a149f1b2364aacbcee2e081389a7748418253d53da3ac5a48a287b605be7f3
160 Risk Score

Malware Insights

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

The OOXML file contains VBA macros that reference PowerShell and cmd.exe. The VBA code includes a Base64 decoding function, suggesting it's used to deobfuscate and execute a malicious payload. The presence of these elements strongly indicates a macro-based attack designed to download and run additional malware.

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
874ab523f5af6de83792a935e87611e5c279732aec9ddc431dcf3e8619393768		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
ae660bc139be4c12c1ec85c0c4fccec67758a2d7add745a06ec30826a3f413a1		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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