Office (OOXML) malware analysis — malicious · 97d0afd86b3c8e3e

MALICIOUS

Office (OOXML)

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

MD5: 2c5ee9c9156ecd601cced418f3c094d5 SHA-1: aafdcfa8825d706929b54001665c28e00a0dd81c SHA-256: 97d0afd86b3c8e3e63ba0cd8cb082f41d163445136f3cf6c4ecbfa03476046ed

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell 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, suggesting an attempt to execute arbitrary commands. The VBA code also includes a Base64 decoding function, which is commonly used to obfuscate malicious payloads. The likely intent is to download and execute a second-stage payload.

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` `97246f4ed8e01590825c12edd565b50bcdd4d4688b9787c4918f6b828e63cc10`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `b54a5b949026b11bc8e1500d1896c87f9b410f6c438d945ee15da55382c86537`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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