Office (OOXML) malware analysis — malicious · 555995f92088b4e1

MALICIOUS

Office (OOXML)

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

MD5: 3b6a73703d4d52f9b2a57949d4a66368 SHA-1: 74e1a2c82579a5abea1e9be170950f3c17072114 SHA-256: 555995f92088b4e1e79fa5cfd0959a2215279d85ffd76979d255483102e14c0f

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 sample is an Office document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA code appears to be obfuscated, but its likely intent is to download and execute a second-stage payload. The presence of these indicators suggests a macro-based downloader 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` `81729be6af88a1c4923435ff5cbca332e9fcb93ab6509dde12049552cae87ecc`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `787ef56f79d557ad0296794f1bf39785d5f8212485d74e3044033b4583ef8873`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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