Office (OOXML) malware analysis — malicious · 0f0d7a2f37f0b863

MALICIOUS

Office (OOXML)

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

MD5: 516a05e1dae8534244c8d6e72baccf47 SHA-1: 5de980f5c232cce70d2828950a542db68efa08fe SHA-256: 0f0d7a2f37f0b8637c533f75fb34aa67bb07e9a27ecab1f5ee95d34da12ddb25

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. The VBA code itself appears to be heavily obfuscated, but the presence of these references strongly suggests it's designed to download and execute a second-stage payload. The Decode64 function is likely used to deobfuscate malicious commands.

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` `44572b314ef331fa7e83903393f94e52446a558ab73c49300b4cef8582fe7801`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `fc58635bdd7b0393a0d32fccb2b7eaa78586193b85c685c454207f6ad605e4d8`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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