Office (OOXML) malware analysis — malicious · a015ef2e65d2b01e

MALICIOUS

Office (OOXML)

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

MD5: 2b676d8d9905a195c483da5f2d54d579 SHA-1: 8e80e200df2a1d5dcd4c6093f891ddbca8cdb9d7 SHA-256: a015ef2e65d2b01e8b1404d30d89333ccc2f67e87406e160f15f8c16fe7edb9b

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 itself appears to be heavily obfuscated, but its likely purpose is to execute further commands, potentially downloading a second-stage payload. The presence of these elements 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` `80d0adf1462bc7f31c97a2fec8f6ee3854cb5332974bd6710bd95b6e780e5c7c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `a266bf7cf62468ef0d2d6870813e67181c8203134f2de5b570adc0cb0efee7b7`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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