Office (OOXML) malware analysis — malicious · 63aae55e619c7010

MALICIOUS

Office (OOXML)

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

MD5: 194e807ede1bae473c554b24cbb51304 SHA-1: adff8b343c4621fd8c674d1535fad8e7c2101a2f SHA-256: 63aae55e619c7010443167f0ffc2a052a3b0a85a71fec09ad1afa013e634f4be

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic 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, suggesting it's designed to execute external commands. The presence of a VBA macro named 'macros.bas' and a 'vbaProject_00.bin' further supports this. The macro's obfuscated nature and the use of PowerShell point towards a downloader or initial execution stage for a more complex attack.

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` `6730ed74dbda92b48f0aedb7820cb5e429806b62e2f4217cd193888b609903f1`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `2238d262f7444e8dadb4814131bbd32811284e48b79a2c44d82f4d414a5166f6`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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