Office (OOXML) malware analysis — malicious · 39bdb9d39afc92f3

MALICIOUS

Office (OOXML)

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

MD5: 810d9559c26d6c651c5726205c08f66e SHA-1: 2688149734bc75fd94e704dc12da134f19cbc01e SHA-256: 39bdb9d39afc92f3d829d3d787fa4f19f911d6ad133f9a1d73451d561832dd3f

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 file is an Excel document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA code itself appears to be obfuscated, but the presence of these references strongly suggests it's designed to download and execute a secondary payload. The Decode64 function is likely used to deobfuscate the malicious commands.

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` `4128411509cb0b07fb85a36a7feb9983406d0e6cf69018246b5c14dbba10a2e0`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `7bdce00955175bf5d06edfc7060da5c215921d0bc6d1c5622e73afedf25e657b`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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