Office (OOXML) malware analysis — malicious · 1e2dd67f2c604fdc

MALICIOUS

Office (OOXML)

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

MD5: 79a679679c033377763aadf8d4787f3f SHA-1: 11e4a5c3c3dd81993c5753ecaac6328f643cf7f6 SHA-256: 1e2dd67f2c604fdcd1269451ef314de7f52cafc06785a57689d5e27523e5f18e

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is an Office document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA macro itself appears to be a Base64 decoder, suggesting it's used to deobfuscate and execute a payload. The primary purpose is likely to download and execute a second-stage payload via PowerShell.

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` `3e092a6efc6aee43612315b9288f48121e6056b90e6c45d53f48584488f58d2a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `be3e77cb68b78bc073810880b1cad63f5d7292ba8ab8e3108b1bea27bd266fad`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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