Office (OOXML) / .XLSX malware analysis — malicious · 8b07c94dd43ce4ee

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: d3be17699d29454e1bacf9b140a30349 SHA-1: 1cd5bab4c998c8110e852ff9110637f074cf92d7 SHA-256: 8b07c94dd43ce4eed991289529199e2247b515ce9a02b0066f359f24a24da5ec

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 macro that executes upon workbook opening, a CreateObject call potentially used to establish a command-line interface, and the extraction of a VBA project file. The macro's `Workbook_Open` event handler likely downloads and executes a secondary payload, potentially a remote shell or a dropper for further malware. The presence of obfuscated code within the VBA project further suggests an attempt to evade detection.

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` `836d0805c77968314e22f8023b05dc371ac6d92ee5fe5795300498339c528c37`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3405 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` `2ddf9b2e896c8513f7e0b5899cd148f3bcf3593085b05f1b7410043080497774`	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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