Office (OOXML) malware analysis — malicious · 1eb008401fcb5637

MALICIOUS

Office (OOXML)

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

MD5: 90c585b7216b7e23f43e6983299e4b99 SHA-1: 2b5833ff97d1761f59b8fbace438bb6bde2791ba SHA-256: 1eb008401fcb56375cd700e63fd4453f9dc571fb9a76f7d6f36545ef7f1afb80

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

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 external commands. The VBA code itself appears to be heavily obfuscated, but its presence and the associated heuristics strongly suggest a macro-based downloader. The lack of specific URLs or clear command strings in the provided evidence prevents a higher confidence score or more specific IOCs.

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` `ffeb041e9bf74cc6c187747ce0415f3a0d1c298cec4f2e6b9efa1aed5366a9a9`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `fa3136a9b228c5b6fb477b878630992d6ff71dbe47f4202c841ce15d78ec9c8b`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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