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

Static analysis result for SHA-256 96c00bb5440efc17…

MALICIOUS

Office (OLE) / .DOC

12.5 KB First seen: 2022-11-09
MD5: 7ec64bb251b19b9c8140882d346afe20 SHA-1: 1c1ac3e26dc2887720fef6579c8a6d53b3167b76 SHA-256: 96c00bb5440efc1708aaeec38359430267bc90b795232b7ce07474b3ba7413b3
380 Risk Score

Malware Insights

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

The critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER and OLE_VBA_WSCRIPT heuristics indicate that the VBA macro is designed to execute obfuscated code using WScript.Shell. The reconstructed URL 'http://www.google.com/search?q=download&oq=download&aqs=chrome..69i57j0l7.1490j0j7&sourceid=chrome&ie=UTF-8' suggests an attempt to download a second-stage payload. The Document_Open macro is the entry point for this malicious execution chain.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Suspicious extracted artifact medium 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
c93f8bcdd11247baae2dff25c78daf718fd016f8067af99f50ad74e4c321cf52		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2496 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).

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