Office (OOXML) / .XLSX malware analysis — malicious · 2c0f3068da419e01

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 5c977390a996f56ebb5dea112f97aae3 SHA-1: 59ea478e842982b7c139f6384fca46f67083226f SHA-256: 2c0f3068da419e01554d72b0455dd18fad270b15d09a8f5abbe5b667f61190bb

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 (macros.bas) that executes upon workbook opening (Workbook_Open). This macro utilizes CreateObject to instantiate COM objects, which are commonly used to download and execute payloads. The presence of a VBA project file (vbaProject_00.bin) further confirms the malicious intent. The macro's behavior suggests a downloader, potentially delivering a second-stage payload or initiating a command-and-control connection. The use of the CreateObject function is a strong indicator of this.

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` `87c496981f664d743b056dfa3e190ee71532bd7571cc8d4e9bd85d7159e5e7be`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3355 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` `e4f5ec4b5a9229e5f605febac9942a0880a5b6f9ffa835f4835d9d6d2ae138a1`	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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