Office (OOXML) malware analysis — malicious · 1e987c4499e2b581

MALICIOUS

Office (OOXML)

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

MD5: 31bcc4428646e5c5729fd8996fac4412 SHA-1: 4fca5f65e058458fc90c1f2d2e6142c3672d6b02 SHA-256: 1e987c4499e2b5817e5ca8a502294cdab1fcd7029f64b03f50fa5257ec885201

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 OOXML document containing VBA macros. Heuristics indicate references to cmd.exe and PowerShell within the VBA code, along with a GetObject call. This strongly suggests the macros are designed to execute arbitrary commands, likely to download and run a secondary payload. The Base64 decoding function present in the script further supports the idea of obfuscated malicious code 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` `bf4edbc0fb7bc74612239c636ea726b61ca7fe6a1a576fb240de97da3a9c02e6`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `dd64a1e7c6cd287ea604dca0cc071b88ffca9b32548f6c082352f260e153af49`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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