Office (OOXML) malware analysis — malicious · c3524a15cdd1ba52

MALICIOUS

Office (OOXML)

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

MD5: ea15b3e8957b285d47e1ad9d730d4df8 SHA-1: 4a82373feab5c2e10c6e10395ec7c25147ee4334 SHA-256: c3524a15cdd1ba5289440d5be90770bdd7cbe2ca51035a2ed327a836ad25d6ec

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1106 Native API

The file is an OOXML document containing a Workbook_Open VBA macro. This macro references PowerShell and cmd.exe, and uses WMI to launch a process. The VBA code also contains a Base64 decoding function, suggesting it's used to obfuscate a payload. The primary intent appears to be downloading and executing a second-stage payload.

Heuristics 6

PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA
VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE

VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
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` `2f95834f2f0ace55fab81038c1cc0f14c63dabc5aa2c9c1cb6d3b0deb481aab8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	36646 bytes
`vbaProject_00.bin` `4895fbcb22dedfd6d5fad992c1853a5767bca2a40b216eb7fd31c507d1e76cb4`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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