Office (OOXML) malware analysis — malicious · dafc4ada6a482c6e

MALICIOUS

Office (OOXML)

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

MD5: 0fafb1a1278f200194202aaabcd993dd SHA-1: 18adca37eb2c1587ed5488a8bfac0e225a45936f SHA-256: dafc4ada6a482c6eaa61af760e0eca7e7686972096985be09e4dd77ee4977cc1

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 Excel document containing VBA macros. Heuristics indicate the VBA code references cmd.exe and PowerShell, and uses GetObject. The VBA code itself appears to be heavily obfuscated, but the presence of these references strongly suggests it's designed to download and execute a secondary payload. The Decode64 function is likely used to deobfuscate the command before execution.

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` `462a8f907ac3a4dac89bd138bdaa699ca471b6e84940ff7ee36e9117d92eb265`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `d8c3fbbc36edc11a124dc9b4a6e27bbde1382cda1253df8b0ceec80d4453cfce`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.