Office (OOXML) malware analysis — malicious · 2523ac167ec8c066

MALICIOUS

Office (OOXML)

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

MD5: 5ea096cfe47b392f61ab1a5634767d10 SHA-1: ed6f2eabdcef47441b3590d005869f2a3741ebc6 SHA-256: 2523ac167ec8c066efd941f2c275763f6b71191f13f6cfa626506fee965cd8a9

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 OOXML document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA code appears to be a Base64 decoder, suggesting it decodes and executes a payload. This points to a macro-based downloader attack pattern.

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` `ed33b1ea308319a85e8c37ef893e1cc6463b946ff36dba0c30c07c8bda7dbf82`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `49c5263834a9d869e40b06c1080ec7cfb1187e288fd19348c246487a9d0b77ad`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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