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

Static analysis result for SHA-256 433ec2548ce2fcdd…

MALICIOUS

Office (OLE) / .DOCX

133.5 KB Created: 2022-02-10 23:15:00 Authoring application: Microsoft Office Word
MD5: 135f83ece706b2d4d2b8bc49010688d5 SHA-1: 861631798038452927cbf5e19b2387aa7456526e SHA-256: 433ec2548ce2fcdd6853216fe49a4b4fbe7b436ea77e70f917bdace9210ecd06
462 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1105 Ingress Tool Transfer T1204.002 Malicious File T1059.005 Visual Basic

The sample contains VBA macros that utilize WScript.Shell to create and execute a VBScript payload. This VBScript, in turn, uses bitsadmin to download a file from 'https://example.com/D0.3.txt' to '%Temp%\b35067d5-28a9-418c-8f96-b8d167df797c.dll'. The script also attempts to reconstruct a URL from concatenated strings, indicating a downloader functionality. The presence of cmd.exe and bitsadmin calls, along with WScript.Shell, strongly suggests a multi-stage infection process.

Heuristics 12

  • 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
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Reference to bitsadmin (download) high SC_STR_BITSADMIN
    Reference to bitsadmin (download)
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • 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
  • 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.
  • 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.openxmlformats.org/drawingml/2006/main
    • https://example.com/D0.3.txt

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
d6b387af346a34fc152bbbc9a3f1d98be0a918e3242090cf39888b8d7ea65169		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4808 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 shell/COM execution token(s).

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