Office (OOXML) / .XLSX malware analysis — malicious · b01cfa9099873cb5

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: d951878c00cb4be4c74ff26e7db914cb SHA-1: b5bdd354ff31843c65375e008a1930429f57dee2 SHA-256: b01cfa9099873cb5bf6ac235143431659b97c20111ca8fa0055bdaba9f52575d

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 exhibits several indicators of malicious behavior, including a VBA-based macro that executes upon workbook opening. This macro utilizes `CreateObject` to instantiate COM objects, which are commonly used to download and execute payloads. The `Workbook_Open` macro is a common delivery mechanism for malware, and the extracted code suggests a download and execution of a secondary payload. The presence of a VBA project file further reinforces this assessment.

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` `fdb7dba9063445c24d5ac722382e68930f8249c3a4b3c6dd6014121b3395101c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3384 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` `e0266fac84ae927d982f6a32be31d58cf962e37a88904b5fbe6967c5d494da0a`	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.

Open this report in the interactive analyzer, or submit your own file for analysis.