Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 665f5745357e53c1…

MALICIOUS

Office (OLE)

253.5 KB Created: 2020-07-20 14:02:15 Authoring application: Microsoft Excel First seen: 2020-09-15
MD5: f67cf0f3df4c9fc3f2c244b63cf982d8 SHA-1: 9d45ff6be70f1e6d44cc34f649ebbdbbce8d22a9 SHA-256: 665f5745357e53c18f3612bc377d59ead4d4561181bb4da6e1941728cf9550ec
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is an Excel 4.0 macro sheet that contains an Auto_Open macro, indicating it is designed to execute automatically upon opening. The document body's text attempts to lure the user into enabling content, a common tactic for macro-based malware. The presence of dangerous formula APIs in the Auto_Open macro further supports its malicious intent.

Heuristics 4

  • ClamAV: Xls.Dropper.Agent-9024594-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-9024594-0
  • 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) 259809 bytes
SHA-256: e14a3a7b9c778773c373b9a7f73013ba041cdf68a748c99dcba72c0affb285ff
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 -  AQcGNQ2
' 0018     20 LABEL : Cell Value, String Constant - AEQUH len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open hidden len=7 ptgNameX  NAMEIDX 5 
' 0018     26 LABEL : Cell Value, String Constant - AZUtbPvlvhF len=0 
' 0018     24 LABEL : Cell Value, String Constant - eBIDDoMYC len=0 
' 0018     29 LABEL : Cell Value, String Constant -         hidden len=7 ptgRef3d  Sheet!ID7431 
' 0018     22 LABEL : Cell Value, String Constant - iOIoFyu len=0 
' 0018     24 LABEL : Cell Value, String Constant - JJwtEdykv len=0 
' 0018     25 LABEL : Cell Value, String Constant - jTRMmzWDLZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - KcHoFmjN len=0 
' 0018     21 LABEL : Cell Value, String Constant - llDoKX len=0 
' 0018     24 LABEL : Cell Value, String Constant - ndtczNpCD len=0 
' 0018     22 LABEL : Cell Value, String Constant - ozkNbqi len=0 
' 0018     27 LABEL : Cell Value, String Constant - PlcTnSElcDAX len=0 
' 0018     22 LABEL : Cell Value, String Constant - qGEfiBq len=0 
' 0018     23 LABEL : Cell Value, String Constant - rkpyAcup len=0 
' 0018     23 LABEL : Cell Value, String Constant - RxycMkqY len=0 
' 0018     25 LABEL : Cell Value, String Constant - TyaHFHVKhY 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 LABE
... (truncated)

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