Office (OOXML) / .XLSX malware analysis — malicious · 937225cbd0737c32

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 4b959e8812e34d65607dd237fbac9a08 SHA-1: 06ab345313c2cab98e83bae0a912798d621b8a3e SHA-256: 937225cbd0737c3212a68da73265a2d988a6c941e9a27229beb32c0507e559b6

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 multiple indicators of malicious activity, including a VBA macro that executes upon workbook opening, a VBA project file, and suspicious artifact detections. The `Workbook_Open` macro is a common technique used to initiate malicious actions within Excel. The script attempts to instantiate COM objects, which are frequently used to perform actions such as downloading files or executing commands. The overall intent is likely to download and execute a secondary payload, potentially a remote access trojan or a downloader for additional malware.

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` `009e42f84986e9ba5c6b675e9f6498a81a0708a499b53d5d846ec5341da7f908`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3600 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` `cda7604829d60fe8b2bde7526ecf4af7f3f1ada33c0cfc96d036925686e3488d`	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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