Office (OOXML) malware analysis — malicious · 43ab37a86139efec

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300

MD5: d20cb0e699fb527d83919bca05402930 SHA-1: 1c992dafab6603932cd72a6d47d4256dc047502e SHA-256: 43ab37a86139efeca2a36f1106033618ffbcf90a6862140694ff7ae2d4cc3e4e

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is an Office document containing VBA macros. Heuristics indicate the VBA code references cmd.exe and PowerShell, and uses GetObject. The VBA macro itself appears to be a Base64 decoder, suggesting it's used to obfuscate a payload that is then executed via PowerShell. This pattern is commonly used to download and execute further malicious content.

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.

Filename	Kind	Source	Size
`macros.bas` `b10e0372b8ddd7d5755d6ca5eca7ed3a03f65c377454b6463f9ae969b3e7f9e2`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `a0f515d9efa3fe44e4aa7f3bf7ea5d185882ab26a3b5105e06f4d517f6faf4d8`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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