Office (OOXML) malware analysis — malicious · 244a946276a89853

MALICIOUS

Office (OOXML)

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

MD5: 090b495fdd687b88a3c4d2b2612e4e04 SHA-1: aa942751401ab6959d42fc73bb9c7a32fd931052 SHA-256: 244a946276a89853d82ad98f561f8a659fdda37ed0bb564f7f07dd7dcc29f8df

160 Risk Score

Malware Insights

MITRE ATT&CK

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

The OOXML file contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of VBA macros suggest an attempt to execute malicious code. The VBA code includes Base64 decoding functions, indicating a likely downloader or stager for 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` `c2489f9768dfeeaa4996d0ddf14e8fac4b82672c62bdab303e5c10b040c7c56b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `15e69817e9ba871796d8410554b0a570a7db4b9470c1d369901e4d15e6253af4`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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