Office (OOXML) malware analysis — malicious · ddb7fbf2386cb291

MALICIOUS

Office (OOXML)

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

MD5: ed6bf7f51357a00b0f976fd4a656b625 SHA-1: 50557b4e20f12d9bd10034184679da82a34ff169 SHA-256: ddb7fbf2386cb2913aa04600605f13a2f24de11948e7f1a674d96b5c65ed595a

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The OOXML file contains VBA macros that reference PowerShell and cmd.exe, indicating an attempt to execute arbitrary commands. The presence of a Base64 decoding function suggests obfuscation of malicious code. This pattern is commonly used to download and execute further stages of malware.

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` `c1188cdba928a7695d5e7ef2167202b9aafaf7bc1562e2f0ae27823563becc54`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `153c0b714ef492f4fe81cfebdf3187b03e09667930dca72ef776e862e4fc0829`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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