Office (OOXML) / .XLSX malware analysis — malicious · bb7ffef0ebd06f1e

MALICIOUS

Office (OOXML) / .XLSX

402.6 KB Created: 2000-04-13 21:48:14 UTC Authoring application: Microsoft Excel 12.0000

MD5: a8246e0d24f8ea3e862a1ee5e2e92e7c SHA-1: 9087d4623328a9b9d833d37b093803259ff42597 SHA-256: bb7ffef0ebd06f1ef21d12e3c35e0794df93f8ec157b422f2f67f7b6449566c4

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1218 System Binary Proxy Execution

The sample is an Excel document containing VBA macros, with a Workbook_Open macro designed to execute automatically. The script utilizes CreateObject to interact with the file system and potentially download or execute further payloads, evidenced by the creation of a file in the user profile directory. The use of LOLBins is also indicated, suggesting a sophisticated execution chain.

Heuristics 6

LOLBin reference in VBA critical OLE_VBA_LOLBIN

LOLBin reference in VBA
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `96888a67f64579efca7a09cb75a2191b65a66a9aa88501f2b26eeb09fdf9d812`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3639 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `1be32cfa7f4eac6685fbda35125701b29d3583ecd354bc90fe601fecbf2fd121`	vba-project	OOXML VBA project: xl/vbaProject.bin	16896 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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