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

Static analysis result for SHA-256 8704af833301cfcc…

MALICIOUS

Office (OLE) / .DOC

35.0 KB Created: 2022-08-01 01:36:00 Authoring application: Microsoft Office Word First seen: 2022-08-03
MD5: c7b9dc9d444dec4f6d49fff5b0e29a99 SHA-1: c79801953f120d56252083e4e27531fb5d382700 SHA-256: 8704af833301cfccd31c077a7d926aac968ce288c21b7522bda7f7a5a4a9acc0
382 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The AutoClose VBA macro executes a command that leverages cmd.exe and powershell.exe to download a file from http://78.85.17.88:8443/quietmoth.exe and save it as C:\Windows\Tasks\quietmoth1.exe. The script then immediately executes the downloaded file, indicating a downloader or dropper functionality.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://78.85.17.88:8443/quietmoth.exe
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
67dd12dfed6d648550749e8d23f33dd00b25fdb601e53879041c16a194e73e15		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 590 bytes

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