Office (OLE) / .XLSX malware analysis — malicious · 590dc2abf6ed3bed

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 23366ac08fa76f237ba90b3373e6cf91 SHA-1: f77499a8fc6e615e21bf111a88c658ba3d5f0f81 SHA-256: 590dc2abf6ed3bedb69b268c3f13b2b09e38aeb771846d21250364c185574d52

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

The file contains VBA macros, including Workbook_Open and Document_Open, which are commonly used to automatically execute malicious code upon opening. The presence of a CreateProcess API call within the VBA code strongly suggests that the macro is designed to launch a secondary payload. The ClamAV detection as 'Doc.Dropper.HexEncodedEXEHeader' further supports this, indicating a dropper functionality. No specific family could be identified, but the behavior points to a downloader or dropper.

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` `a2532f29a1b47036326a0f09760daf809217df577b2f3384e875fb7cb2134514`	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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