Office (OOXML) malware analysis — malicious · 4b7f5257e62c1834

MALICIOUS

Office (OOXML)

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

MD5: f8fbf8c2588297e55205d25693b0e7d8 SHA-1: 7c1e4a9cbdc53c9932dd27b1a434f9235189addf SHA-256: 4b7f5257e62c18348e82ed0ca375fb7606ddaf7b348d14ffacf0038efc9e66cc

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell 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 intent is likely to download and execute a second-stage payload. The presence of VBA macros and the execution of external commands are strong indicators of malicious intent.

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` `143cceb0e2fb40a6a8115c0b0e55f468267072f541dc06a2a73f96a6d9bdc806`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `44119d957cf3354794d92074975ea16056abfdc3fb3bc2d378674b336684c489`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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