Office (OLE) / .XLSX malware analysis — malicious · 4d2958d93d4650fc

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 057e58ff00be3032fd6e3f5d2cc80905 SHA-1: 56380a652471962387693f4bcc893fd21f0fc324 SHA-256: 4d2958d93d4650fc4a70f70663fe6943e8c11d61b2824512da296e8fd84e5bb9

248 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

This XLSX file contains VBA macros, including Workbook_Open and Document_Open, which are designed to execute automatically. The script utilizes the CreateProcessA API, a strong indicator of payload execution. The ClamAV detection 'Doc.Dropper.HexEncodedEXEHeader-9789587-1' further supports that this file acts as a dropper for malicious content. The presence of the 'macros.bas' file and the direct API call suggest the primary function is to download and execute a second-stage payload.

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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