Office (OOXML) malware analysis — malicious · 73d9d2256ec3afc1

MALICIOUS

Office (OOXML)

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

MD5: a0e5eea40b4e3f0887ad203f0e3bd3d3 SHA-1: ca9711274cabe4a8da5cdd078533e4905f938115 SHA-256: 73d9d2256ec3afc12382e9843ce551c5452c892ee67f1b0e00906e36d5b31d3f

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The file is an Office document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject, suggesting it's designed to execute arbitrary code. The presence of a Decode64 function and the obfuscated nature of the VBA code strongly imply it's a downloader 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` `b38494dd9811d5d31a4fa22b0a9f74ba6031576b1fe650c23de1fbba1fbb220e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `79377a139bd0b44f3020c7c471b27e5b43a957b9c2c86d40cbac590f180e875d`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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