Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e4574d74af19350d…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 97c719c3861ce161f49b43acac43d0aa SHA-1: ef6901c855261813f68783332fb5f19ec28f45a0 SHA-256: e4574d74af19350dd4ff89adeac5828c3d89859923e057bbce2fe2241f427f9d
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, which is commonly used to obfuscate malicious payloads. The critical heuristic 'OLE_VBA_PS' strongly indicates that PowerShell is being invoked, likely to download and execute a secondary payload.

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
187d4aafeb41a422464e5bd563d758a94d22344648dc44d19571000c1a1e5841		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
b44e763c8c5eaf54ad6fa0b539f022612a0e433c61b16366d71bcac3dddfee70		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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