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

Static analysis result for SHA-256 b74bcc9ed2dd9efe…

MALICIOUS

Office (OLE) / .DOC

101.5 KB Created: 2020-03-19 15:06:18 Authoring application: Microsoft Excel
MD5: 42b41fc56742258b730182e8e9e82e45 SHA-1: a587943bed7931056298e1856acff37fb6a9def5 SHA-256: b74bcc9ed2dd9efe1e9c60571770ef74019cebaa07753db773daa4bd7e6deddd
180 Risk Score

Malware Insights

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

The sample is an Excel document containing Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN heuristic. These macros utilize dangerous functions like RUN (via OLE_XLM_DANGEROUS_FN) and reference ShellExecute and URLDownloadToFile APIs. The primary intent appears to be downloading a second-stage payload, likely 'crypt.dll', from the IP address 209.141.54.161, as evidenced by the embedded URLs. The extracted artifact 'xlm_macros.txt' further confirms the presence of macro code.

Heuristics 6

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • XLM Auto_Open with dangerous formula APIs high OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • 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://209.141.54.161/crypt.dll~
    • http://209.141.54.161/crypt.dll
    • http://209.141.54.161/crypt.d

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
ee52e115f36db151196ecfd4f06e18e0f30fadad0ff993953f531ab5a806ab28		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 28191 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).

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