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

Static analysis result for SHA-256 f0f4e0414ae7ba4c…

MALICIOUS

Office (OLE) / .DOC

527.0 KB Created: 2020-06-23 10:45:00 Authoring application: Microsoft Office Word
MD5: 8abd99e0aa6e6dc2faca8204a28d3021 SHA-1: 71a83d8f641bc9be93dc70c55dc659b1b5662096 SHA-256: f0f4e0414ae7ba4cfad5a4a6a0bbee3dc5e241b16980297d7f156bd5ead739f2
228 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample contains VBA macros, specifically an AutoOpen macro, which is a common delivery mechanism for malicious payloads. The script utilizes `CreateObject` to instantiate `wscript.shell` and attempts to download a DLL from `https://caranatrium.com/vertusa.dll` or `https://marutoba.com/frt.dll`. The `on_hearing_from` function appears to implement a delay loop, potentially for evasion. The presence of `wscript.shell` and the download attempt strongly suggest the execution of a second-stage payload.

Heuristics 8

  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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 https://caranatrium.com/vertusa.dll
    • https://marutoba.com/frt.dll
    • http://www.w3.org/1999/XSL/Transform
    • http://schemas.openxmlformats.org/drawingml/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/bibliography
    • http://schemas.openxmlformats.org/officeDocument/2006/customXml

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
cbcab2309af5750450f49fdb3b1fcb31b212724c5c2f34983746fdc1923b3f5d		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 13549 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 35 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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