Office (OLE) / .XLSX malware analysis — malicious · 524c09686aa7bef3

MALICIOUS

Office (OLE) / .XLSX

3.86 MB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2026-02-25

MD5: 88968411e436419f7a772a92aa0b5b33 SHA-1: 777040bed9d26f5da97e8977c6efc0586beae064 SHA-256: 524c09686aa7bef3299f4772caff5627dda772ad8bf460c0f10b600da8e11f97

248 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1059 Command and Scripting Interpreter

The file contains VBA macros, including Workbook_Open and Document_Open events, which are commonly used to automatically execute malicious code upon opening. The ClamAV heuristic identifies it as a dropper, and the presence of a `CreateProcess` API call in the VBA code suggests it's designed to launch a secondary payload. The extracted artifact `macros.bas` is the source of these macros. The document body 'Daily Fuel Consumption-USG-' is a lure to trick the user into opening the malicious file.

Heuristics 7

ClamAV: Doc.Dropper.HexEncodedEXEHeader-9789587-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.HexEncodedEXEHeader-9789587-1
Reference to CreateProcess API high SC_STR_CREATEPROCESS

Reference to CreateProcess API
Document_Open macro high OLE_VBA_DOCOPEN

Document_Open macro
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
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 macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `7aff7be05b483d522bc9ff57a3e19bafcb6e9b1cef5faa59af0fe62d9c65438b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	4001 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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