Malicious Office (OLE) / .DOC — malware analysis report

Static analysis result for SHA-256 44b25fc20a9882af…

MALICIOUS

Office (OLE) / .DOC

33.0 KB Created: 2019-06-07 11:21:00 Authoring application: Microsoft Office Word
MD5: 19f36f566b132a78e1322f663f344f05 SHA-1: 9aaf77fccdb21de9cbec2f85ef76f9363e0cc161 SHA-256: 44b25fc20a9882affa7a9623543e7e7f36da01aa874ac3acb670592031dcc9bc
568 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer T1204.002 Malicious File T1027 Obfuscated Files or Information

The sample contains a VBA macro that utilizes `Shell()` and `CreateObject()` to download and execute a payload. Specifically, the macro references `certutil` and an obfuscated URL, indicating it's designed to fetch and run a second-stage artifact. The presence of `WScript.Shell` and `Document_Open` further supports this dropper functionality. The extracted URL `http://symposium-bkmc-mmc.pk/assets/UTREWESV.bbc` is highly suspicious and likely hosts the secondary payload.

Heuristics 14

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
  • Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
    VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
  • ClamAV: Doc.Dropper.Agent-6993785-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6993785-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Reference to certutil (download/decode) high SC_STR_CERTUTIL
    Reference to certutil (download/decode)
  • 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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://symposium-bkmc-mmc.pk/assets/UTREWESV.bbc
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
e036296c6c0aa1c0ad74253029a022d23f307fa558131cc8f7a7c599228a8fac		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 960 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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