Office (OOXML) malware analysis — malicious · 6a952b3af21d83ee

MALICIOUS

Office (OOXML)

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

MD5: 77d894d686cd3a6c8515d11aa8b317ad SHA-1: 7490ecfbbf5c31d843ab41a904ae05db1abee841 SHA-256: 6a952b3af21d83eea61a09987d32bdc5d1a9dfefbd05473258e0234cf0743365

160 Risk Score

Malware Insights

MITRE ATT&CK

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

The OOXML document contains VBA macros that reference PowerShell and cmd.exe. The VBA code itself appears to be heavily obfuscated, but the presence of these references strongly suggests an intent to download and execute a second-stage payload. The GetObject call further supports this, as it can be used to instantiate COM objects that facilitate malicious actions. The specific obfuscation and lack of clear URLs make precise family attribution difficult.

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` `7ef0f049c95742797a914419e25c65d437ffb3033d839d14ec3f4a33953713d2`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `0bc1e435e368637f84a9ec2d1453739ebf07a9aee6b8a7ad61dfc6873c7f7f48`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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