Office (OOXML) / .XLSX malware analysis — malicious · 2b859d38c6d894f8

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: ff46a7d9844b4b0d896d776248477987 SHA-1: 36f16798e2f30063cf4f5f219cc95a603336abc2 SHA-256: 2b859d38c6d894f8fe9f1198514b19227286c8757477a305d6c4603cc4990496

140 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

The file contains a VBA macro that executes upon workbook opening, a common tactic for delivering malicious payloads. The `CreateObject` call suggests the use of COM objects, potentially for downloading and executing a secondary payload. The extracted VBA code attempts to establish a connection to a remote host, likely for command and control. The presence of a VBA project file further reinforces this macro-based delivery mechanism. The heuristics confirm the presence of a VBA-based downloader.

Heuristics 4

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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `932d53eabee22a2cc1a32f8cb29edc5bea9b4a4d412aa31323e5a5de576a2228`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3470 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `f292c93e4a223d9257f54d2f6096006c1cbd7890ceb4f188c2ada1d5908ae41c`	vba-project	OOXML VBA project: xl/vbaProject.bin	16384 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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