Office (OOXML) malware analysis — malicious · 7351b3744529e9e8

MALICIOUS

Office (OOXML)

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

MD5: 4dc38195f666509aa889d54ea67629a9 SHA-1: 5a7db0c199f9e361ffbd9ca5ba150a06b124f102 SHA-256: 7351b3744529e9e8fc4e0b9ce8b1eec1dfd48afeef766f99ff4f3531e73fe54a

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic T1059.003 Windows Command Shell

The file is an OOXML document containing VBA macros. Heuristics indicate the presence of PowerShell and cmd.exe references within the VBA code, suggesting an attempt to execute external commands. The VBA code itself appears to be heavily obfuscated, including a Base64 decoding function, which is commonly used to hide malicious payloads. The primary function of the script is likely to download and execute 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.

Filename	Kind	Source	Size
`macros.bas` `f8f4bc077f177353944dca733fac52dc44a7d2f36dc5a1732ff1c6288452256a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `3123897139dcfe5791022823afb8c431a1450b1aa6372f941d0d7f294606847b`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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