Office (OOXML) malware analysis — malicious · 905e2b388767361b

MALICIOUS

Office (OOXML)

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

MD5: 4d203e5120d31282aace157258d38f71 SHA-1: 44a0a8ec4e7815090dee576051700eb077e38b33 SHA-256: 905e2b388767361b93ec61b9f6fbc92739b43f6b56c144544bb3696ab6fc72d1

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The file is an OOXML document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses the GetObject function. The VBA macro itself appears to be a Base64 decoder, suggesting it decodes and executes a malicious payload. The primary function of this macro is to facilitate the execution of a second-stage payload, likely downloaded from a remote source.

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` `9697b55eb7cf751b5e8803a0cb4923711dedde13db6d38e6f01a1c77b279e78c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `0b67f3c9fddd314a533426d31918c024eea1e68e8f927bbed240614bcb76621d`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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