Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 80a76d92dea21c70…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: cd3981fa37ab293f9292b1f6294652ee SHA-1: b4a37779e22b8b59527c64bbe1a00f6019cfde10 SHA-256: 80a76d92dea21c7042b1e37f76bd640d4c64e9cc6471fcc9570712db5c6d785e
160 Risk Score

Malware Insights

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

This OOXML document contains VBA macros that reference PowerShell and cmd.exe. 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 primary function of the script appears to be downloading and executing a second-stage 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
11606c6493ad3a63c70481249bb08197413556a6ad2f1672707d3ae48e2d93cf		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
ee9c94a4c41b85819e0f66487131a3c959f02ed247454b85ab721c230ac34e02		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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