Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 1722aa351a87f2d9…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 700f15c675ad71925c3273ca1810866b SHA-1: 3c9e63d7027374abae155e04199396f244f8fd9c SHA-256: 1722aa351a87f2d93c9f2a866e370e289e3c204a376725e1fd179329595dad3d
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 VBA macros suggest an attempt to execute arbitrary code. The VBA code includes a Base64 decoding function, indicating that it likely decodes and executes a payload from obfuscated data.

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
e1e0359e16cb5f56c7bc0a3494bea96fe79f06180cb5f2d1850eee4e1b14ebab		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
b6602c0b7097326b28696a73b667403301d5387433d4f2333ea871afe7e8cda3		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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