Office (OOXML) malware analysis — malicious · f455dff98dd6118b

MALICIOUS

Office (OOXML)

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

MD5: c57fd54ac86f128bc6f2c3086570dc52 SHA-1: 15e3affa83d1a968f5a98c11d005abdb3957b322 SHA-256: f455dff98dd6118b8d5a2168c984b32fb99e5e6b5b607f8ffc8b6fc00ef0f6a8

160 Risk Score

Malware Insights

MITRE ATT&CK

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

The Excel document contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of VBA macros suggest an attempt to execute arbitrary code. The VBA code includes a Base64 decoding function, indicating that it likely decodes and executes a malicious payload. The specific payload or its destination could not be determined from the provided evidence.

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` `4a70e15f25f596586ebaf9820fdebb41b537435587c23fa3e5a5e6cba7557c30`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `b5725a0fa3fb725ec96855f1c715978f519d500371cdd66761ec2d067c1a4675`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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