Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7bd54535b952596d…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:46:01 Authoring application: Microsoft Excel First seen: 2021-06-30
MD5: f1ecad71fafa84a8db1bde33c42bb5d6 SHA-1: 3d6605666b34a9a315857358ee401b9d20946f90 SHA-256: 7bd54535b952596d52753c1e830fe880dea776accad5d053d500c36dfe5e9fcf
140 Risk Score

Malware Insights

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

The file is an Excel document containing Excel 4.0 (XLM) macros, specifically an Auto_Open function. This function is designed to automatically execute code upon opening the workbook, indicating a likely attempt to run a malicious payload. The presence of dangerous formula APIs like RUN further supports this assessment.

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) 6686 bytes
SHA-256: f49261c45fcdd9bebe9bb90a54c8b0e23e76b0fc07fa8dd32b6ea8717bffb331
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  EtQKQHqCfmm
' 0018     27 LABEL : Cell Value, String Constant - AOuhoYbftRfe len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I147 
' 0018     25 LABEL : Cell Value, String Constant - DstEMbdVLT len=0 
' 0018     21 LABEL : Cell Value, String Constant - GcjSxq len=0 
' 0018     27 LABEL : Cell Value, String Constant - GuePrEsDNBZC len=0 
' 0018     23 LABEL : Cell Value, String Constant - hMaeEAGE len=0 
' 0018     25 LABEL : Cell Value, String Constant - kAvgMDUdPC len=0 
' 0018     26 LABEL : Cell Value, String Constant - MArgqscujEZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - MkhJvKdjpbdX len=0 
' 0018     22 LABEL : Cell Value, String Constant - rxwNiXz len=0 
' 0018     23 LABEL : Cell Value, String Constant - sSGkEiFV len=0 
' 0018     24 LABEL : Cell Value, String Constant - STSCfWSLd len=0 
' 0018     26 LABEL : Cell Value, String Constant - tuaTTbDaDrv len=0 
' 0018     20 LABEL : Cell Value, String Constant - UAnDy len=0 
' 0018     26 LABEL : Cell Value, String Constant - VfoILQQOcgx len=0 
' 0018     27 LABEL : Cell Value, String Constant - WuaXnMQIVdCZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - XBDYaRidDb len=0 
' 0018     20 LABEL : Cell Value, String Constant - XvRZF len=0 
' 0018     20 LABEL : Cell Value, String Constant - YMJlO len=0 
' 0018     27 LABEL : Cell Value, String Constant - yxHZUBmGrZnF len=0 
' 0018     26 LABEL : Cell Value, String Constant - zGRlPPkvBby 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 Co
... (truncated)

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