Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4d7015bfe334f795…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 2ee950df04404c5d30b4fa5d79b219af SHA-1: 6e2d942a8fb4bb2599d23a452140d151e8d60471 SHA-256: 4d7015bfe334f7953b36ca086766550f5808034ba5767bf9c5139f00e2ee883b
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 a Base64 decoding function suggest that the macro is designed to download and execute a secondary payload. The specific obfuscation and lack of clear 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
c9072b4c307f5000224b3d0230973622d4dbe2607194a172c8e4cc675c58ab0b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
d56832be26c98554fbbb49b5906c2cd8d7353304e5014f86362134afbaf7503d		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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