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

Static analysis result for SHA-256 5e4778cd2fb2de78…

MALICIOUS

Office (OLE) / .DOC

96.5 KB Created: 2020-03-19 21:34:27 Authoring application: Microsoft Excel
MD5: c8b207fe67d1a76063769cd73da8407b SHA-1: dffe628fabd04de78ba6c2aeb2b9a966a0d75221 SHA-256: 5e4778cd2fb2de7855b836bbf3c59f47d660e68ba29a2976575e914b6f66f5a5
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, including an Auto_Open macro, which is a critical indicator of malicious intent. The macros utilize dangerous functions like RUN and ShellExecute to download and execute a payload from the provided URLs. The presence of URLDownloadToFile API calls further supports the payload downloading behavior.

Heuristics 7

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical 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.
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • 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 https://aperforrmingnextyou.xyz/372873/svu.dll~
    • https://aperforrmingnextyou.xyz/372873/svu.dll
    • https://aperforrmingnextyou.x~

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
6cd894a56b3fecaff9e5260cf3d7427aa7e37628410c8ea078aacce1bf2c1fcd		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 29754 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).

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