Office (OOXML) malware analysis — malicious · a4f16e6509ca2ab9

MALICIOUS

Office (OOXML)

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

MD5: 41179f00c4748c6be7ab163fc67032d3 SHA-1: 1a0261b48f3acd07c3308129ac4f0c01b6cd8860 SHA-256: a4f16e6509ca2ab9e49a2adea96cc660d4a3a3e97c274ad6582b7091b38caae5

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 OOXML file contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of VBA macros suggest an attempt to execute arbitrary code. The macro's obfuscated Base64 decoding function likely decodes and executes a malicious payload, which is a common technique for downloading and running further stages of malware.

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` `8b4d745d87af2f70aaad23e6d81c7fd294aa1d5bc685eaed6d9b268432cbcdcd`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `74a625733842ac838a66d2633b6d2bca21873eba2cad2fa71f85516be7906804`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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