Office (OOXML) malware analysis — malicious · 40570d0e6e1cedd9

MALICIOUS

Office (OOXML)

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

MD5: d8db3071773172968d34e1092df5c7fa SHA-1: 81b98e3816e0440c78369886c3814018b764774c SHA-256: 40570d0e6e1cedd96499db2414c2c797116d798402b962d748262e038715182a

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 OOXML document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA macro appears to be obfuscated but likely decodes and executes a second-stage payload using these commands. The primary function of this macro is to facilitate the execution of further malicious code.

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` `10ac8f34370bea7a5e4ed135bf68d2a5c3691c9176b06cc5602bb751373d55d0`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `4aaac57b78c045391018f86b44641a52df33804240c4e6dc915336c2af8dd458`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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