Valyria — Office (OLE) / .DOCX malware analysis

Static analysis result for SHA-256 cf4adca8773145cf…

MALICIOUS

Office (OLE) / .DOCX

893.0 KB Created: 2021-11-23 11:34:00 Authoring application: Microsoft Office Word
MD5: 10f35ddd335ecd684cecf96372aac468 SHA-1: 942574b14f31d8f6fa53ba52362eb1d44ca68735 SHA-256: cf4adca8773145cf0a1d4ba32d555643442e14e9181ae8450bfb79ab86144914
282 Risk Score

Malware Insights

Valyria · confidence 85%

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 User Execution: Malicious File T1027 String concatenation T1105 Ingress Tool Transfer

The sample is a Word document containing VBA macros that execute automatically upon opening via Document_Open. The script reconstructs the 'Scripting.FileSystemObject' object to interact with the filesystem. It checks for the presence of 'zoro.doc' in the user templates path and, if absent, attempts to drop a payload. The pppx subroutine specifically opens 'zoro.doc' with the hardcoded password 'donttouchme'.

Heuristics 8

  • Office EPRINT stream contains EMF object high CVE related OLE_EPRINT_EMF_OBJECT
    OLE ObjectPool contains an EPRINT stream with EMF data. This is rare in normal documents and is CVE-2007-3893/MS07-046-family evidence when paired with Office exploit payload anomalies, but the malformed EMF record is not proven by this rule alone.
  • ClamAV: Doc.Dropper.Valyria-10001412-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Valyria-10001412-0
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • 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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.microsoft.com/office/2006/encryption
    • http://schemas.microsoft.com/office/2006/keyEncryptor/password
    • http://schemas.microsoft.com/office/2006/keyEncryptor/certificate
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
8035462e7e46acedefab3706a2f361f75b7d71e90dfe26fe820f3eca23ff837e		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2929 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
ole10native_00.bin
9a4cdaa0e0fa0ce7d71e57202091b0409b97ded559645c7b17bda18b27700880		 ole-package OLE Ole10Native stream: ObjectPool/_1699143983/Ole10Native 292131 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.93, consistent with packed or encrypted content.

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