Office (OOXML) / .XLSM malware analysis — malicious · 3346dbacdf7e0f24

MALICIOUS

Office (OOXML) / .XLSM

88.1 KB Created: 2020-12-30 13:41:36 UTC Authoring application: Microsoft Excel 15.0300

MD5: 709a312090cb59e631148d0d3cf05fef SHA-1: 9358cd10d7a6d2e680e41feb6b13b649aebd87b7 SHA-256: 3346dbacdf7e0f240dd2ed2f99af41e4106e10039f096a8142fed178c4413fd9

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059 Command and Scripting Interpreter

The OOXML file contains VBA macros, specifically a Workbook_Open macro that utilizes the Shell() function. This indicates the document is designed to automatically execute a payload upon opening. The presence of a long encoded blob and VBA auto-execution terms further supports a malicious intent, likely to download and run a second-stage payload.

Heuristics 4

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `5d60f5419e7a4419976cd575a41af85d7dcce8181084b59fab9e1f41836c0e69`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3007 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `eb978a6f7b251d42c863f4aba206f5581b17e2e613db6b9b25fe169b8e837cf1`	vba-project	OOXML VBA project: xl/vbaProject.bin	20480 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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