Office (OOXML) malware analysis — malicious · def9b78b204110d0

MALICIOUS

Office (OOXML)

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

MD5: 7279e1a4c04f824a61fba1d82620ac6f SHA-1: c9aa3ab762dc780e0a731c955ba17b79d2543a1b SHA-256: def9b78b204110d03a6c0f4cff5073b463b4c48f88878ab20db81226a97a6ee0

160 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Office document containing VBA macros. Heuristics indicate the macros reference cmd.exe and PowerShell, suggesting an attempt to execute arbitrary commands. The presence of a Base64 decoding function within the VBA code implies that malicious code is likely obfuscated and then executed. This pattern is commonly used to download and run additional malicious payloads.

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` `cd239e5f0c5e8055cbf0fc7c1b61ae20c8b1a001b19166b36a67aeb488c5bf9c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `073ac5be702eeb68734f7a54b7d617a9405eea9c1d74a7c6e657f4ad6d59344a`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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