Office (OOXML) malware analysis — malicious · d833f1e1f0b014b1

MALICIOUS

Office (OOXML)

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

MD5: 39f9107ad101efbf34c6f4749a5e0563 SHA-1: ae75158b3932412a996cdb7b03b9cf79974d6032 SHA-256: d833f1e1f0b014b1ccfc9f3085d3ea6860c5358f298d9778ca4823ccc02d0cc1

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The OOXML 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 macros appear to be obfuscated, but the intent is likely 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` `c69abfc45802dbcb1271b0baf4a0000fbf7097645ec0cdbe12b80d5017832e83`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `56f1ff175558dc3a204fa78ddca923a9989fd32b700d03a77f3b3b207fc91264`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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