Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e7d8d835668552d2…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:34:19 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 4eae0e3db985bb9182635a47cb2d01ef SHA-1: 387e00e010b29de40fb4c02474c4e4ebbfe253cc SHA-256: e7d8d835668552d27560245b2db7dba637834276a414490b699fe752600abe2c
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, specifically using dangerous functions like RUN. This strongly suggests the macro is designed to execute arbitrary code upon opening the document. While no specific URLs or payloads were extracted, the technique implies a downloader or initial execution stage for a more complex attack.

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) 6603 bytes
SHA-256: c5608880038bff91c724d617bfc72a53865431522e69df58a955ec5752203c70
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  lguowHWIk
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B198 
' 0018     26 LABEL : Cell Value, String Constant - bLfRcofCQFF len=0 
' 0018     27 LABEL : Cell Value, String Constant - CCKKGMPJVBLT len=0 
' 0018     23 LABEL : Cell Value, String Constant - ckPdsIWT len=0 
' 0018     24 LABEL : Cell Value, String Constant - cUEXDHNMu len=0 
' 0018     23 LABEL : Cell Value, String Constant - EcHwAwme len=0 
' 0018     22 LABEL : Cell Value, String Constant - gFaFlpq len=0 
' 0018     23 LABEL : Cell Value, String Constant - gZQvnVAD len=0 
' 0018     21 LABEL : Cell Value, String Constant - HeBcyn len=0 
' 0018     25 LABEL : Cell Value, String Constant - ieWOYjpRen len=0 
' 0018     27 LABEL : Cell Value, String Constant - lmeoLmJNYipb len=0 
' 0018     22 LABEL : Cell Value, String Constant - ntFJPKZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - NwucqjK len=0 
' 0018     23 LABEL : Cell Value, String Constant - OkCGeDoP len=0 
' 0018     24 LABEL : Cell Value, String Constant - OZUPrtIRN len=0 
' 0018     25 LABEL : Cell Value, String Constant - pRCNfuyACM len=0 
' 0018     23 LABEL : Cell Value, String Constant - PynMVKar len=0 
' 0018     22 LABEL : Cell Value, String Constant - TPokSGu len=0 
' 0018     26 LABEL : Cell Value, String Constant - UgbcNUbaIJE len=0 
' 0018     22 LABEL : Cell Value, String Constant - wPCUkBr len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZTJJmLlVBF 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
' 
... (truncated)

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