Office (OOXML) malware analysis — malicious · 733265cf985c2007

MALICIOUS

Office (OOXML)

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

MD5: 163e74209d0eba643f58e9ea460c3bdc SHA-1: 1bf18ba8d6799b52f4a86283078508f631b97ac2 SHA-256: 733265cf985c2007b2018ade9bfdf171664330ba3cffced1976ec11d5611c409

160 Risk Score

Malware Insights

MITRE ATT&CK

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

The OOXML file contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of VBA macros suggest an attempt to execute malicious code. The VBA code includes a Base64 decoding function, indicating that it likely decodes and executes a payload, possibly downloaded from a remote source.

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` `814f633f1ceb33913bbe8e99576e75d369242d85b86f876ba8643392bc8d67e0`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `8d7f946e9730b25b137c9e6847578ade39a0af91aaaeb4b9c69a5cb3407c86e8`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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