Office (OOXML) malware analysis — malicious · 980d71f0f0e9ae70

MALICIOUS

Office (OOXML)

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

MD5: 9233337625565af3b6e1a3216c186ad9 SHA-1: 4bf0829a85331fe4ba46644ad5c8c6f5d0359f24 SHA-256: 980d71f0f0e9ae70de2bc869fc5e03554d1755a64b19f49f7bf2d0d77f8452b6

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 Office document containing VBA macros. Heuristics indicate the presence of PowerShell and cmd.exe references within the VBA code, suggesting an attempt to execute external commands. The VBA code also contains a Base64 decoding function, which is commonly used to obfuscate malicious payloads. The likely intent is 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` `97dadefe8ad7f30a7b70701b5850dad0175348417f6ec055c9a4e50451910abd`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `23e782c8889b47c6f79551537a06042d97699a2bca68aac3cfb43e79059f3896`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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