Office (OOXML) malware analysis — malicious · 43bd46e4200fb345

MALICIOUS

Office (OOXML)

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

MD5: fa3409e79fb04b6f9c50a22fb1a13920 SHA-1: eacbdfd6d4aeeac12b2a7fe0892c6401f7d8fde4 SHA-256: 43bd46e4200fb345c1d7f44730ab57a280892c468ea5bfe9a86c60600fac36f5

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 macros reference PowerShell and cmd.exe, and use GetObject. The VBA code itself appears to be heavily obfuscated, but its structure suggests it's designed to decode and execute further commands, likely downloading a second-stage payload. The presence of these indicators strongly suggests a malicious macro 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` `e4295f5358f0aab8203d4cacacdc3f792bfc394442edef3be367c58bb3895411`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `bf6479d403e6321805faa41b9077176946519739e20948608a37fe67fb4e9bda`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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