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

Static analysis result for SHA-256 b1a8d6bb600c4b4e…

MALICIOUS

Office (OLE) / .DOC

96.5 KB Created: 2020-03-19 21:34:27 Authoring application: Microsoft Excel
MD5: 8a5c34e3990e3a1c511f2fd88abbf457 SHA-1: aeac527f34fb8b22aae4de644b7d1521ee23419f SHA-256: b1a8d6bb600c4b4ee535dc69306f026b2fab9de9690f3be25e0aec055d671c44
240 Risk Score

Malware Insights

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

The sample is an Excel document containing Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics. The macros reference ShellExecute and URLDownloadToFile APIs, suggesting an intent to download and execute a second-stage payload. The embedded URLs, specifically 'https://aperforrmingnextyou.xyz/372873/svu.dll', are likely sources for this payload. The ClamAV detection as 'Xls.Dropper.Agent-7637818-0' further confirms its malicious nature as a dropper.

Heuristics 7

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • ClamAV: Xls.Dropper.Agent-7637818-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7637818-0
  • 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 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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