Office (OOXML) / .XLSX malware analysis — malicious · ea2395f76f2bb596

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 931e108bbd2f6571761a53a8ad260e79 SHA-1: 150c1154fb3b66afe486acfe70069701b3e79d7c SHA-256: ea2395f76f2bb596baa84ede5acca6e8d64ad2580990e04212ec77ac1503e78d

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter T1071.001 Application Layer Compromise T1566.001 Phishing T1071.002 Remote Services - SMB/Windows T1071.003 Remote Services - Web Service

The file contains a VBA macro that executes upon workbook opening. This macro utilizes `CreateObject` to instantiate COM objects, including `WScript.Shell` and potentially `XMLHTTP` for downloading files. The use of `Environ()` suggests an attempt to locate temporary directories. The LOLBin reference indicates the use of a legitimate Windows tool for malicious purposes, likely to obfuscate or execute payloads. The macro's behavior, combined with the extracted URLs and the VBA project, strongly suggests a macro-based downloader attempting to establish a remote connection and execute a secondary payload. The `Workbook_Open` event handler is a common vector for delivering malicious code in Office documents.

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` `f897f7c1cbef049352021d5983bbde5034136c01c58cd8f0d3c3391bfd632538`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3544 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` `de38ce86e0b6b86ed2a3dbd97c65e5cfc8855fcb6edaab1a207f7c62ca637b68`	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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