Office (OOXML) malware analysis — malicious · 7c842999247293ea

MALICIOUS

Office (OOXML)

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

MD5: 15e12c4acdba79a4d9719b9a672f4980 SHA-1: a807f15ae73c5713e5f1ba2c4f80d65aac11e09c SHA-256: 7c842999247293eab5704172899a140969b5fe2a8c0d509ef2c623623a863b59

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 its structure suggests it is designed to execute further commands, likely downloading and executing a second-stage payload. The presence of these indicators points to a macro-based downloader.

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` `57d1b2128584317f1538014d0096b0a78832d3816110b8e23427af3e4295ee84`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `28f8f16f57590149cba897f4ee1853b92840270bd67975c88a9b217e78f6e5f8`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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