Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 be10ecd391974c87…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:01 Authoring application: Microsoft Excel First seen: 2021-05-26
MD5: 2f81d7f900f3b8bc4c12b6aefde7d74b SHA-1: d53a366c76ce37945b9408875a3c8021227278e0 SHA-256: be10ecd391974c87255f93952cb34413911509e9f6f9f2e794260f9008b51c1f
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 defined name, which is a common technique for executing malicious code upon opening the document. The presence of dangerous formula APIs like RUN further supports this. No specific IOCs like URLs or file paths were extracted, but the mechanism strongly suggests a downloader or initial execution stage.

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) 6548 bytes
SHA-256: fc909bbcd5101b65860137c44eec708ae96f69e8ae5f6713c25b2480c5751fce
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 -  yDsDxzw
' 0018     20 LABEL : Cell Value, String Constant - AjlsK len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D173 
' 0018     27 LABEL : Cell Value, String Constant - CDodAUebuVzY len=0 
' 0018     27 LABEL : Cell Value, String Constant - CmlqOmrsYmUR len=0 
' 0018     20 LABEL : Cell Value, String Constant - DkQfd len=0 
' 0018     21 LABEL : Cell Value, String Constant - fcFxWN len=0 
' 0018     27 LABEL : Cell Value, String Constant - hGlHsAyVdyPU len=0 
' 0018     21 LABEL : Cell Value, String Constant - jbMUZb len=0 
' 0018     20 LABEL : Cell Value, String Constant - LiPrq len=0 
' 0018     24 LABEL : Cell Value, String Constant - lPNBUQZQl len=0 
' 0018     20 LABEL : Cell Value, String Constant - mHhiz len=0 
' 0018     21 LABEL : Cell Value, String Constant - MYnAnP len=0 
' 0018     22 LABEL : Cell Value, String Constant - oONuldl len=0 
' 0018     27 LABEL : Cell Value, String Constant - PEoHfNyjAtmf len=0 
' 0018     22 LABEL : Cell Value, String Constant - PLkyMyS len=0 
' 0018     23 LABEL : Cell Value, String Constant - RbfbEdCZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - scENTrMTkkK len=0 
' 0018     26 LABEL : Cell Value, String Constant - tapEWYQpOZz len=0 
' 0018     23 LABEL : Cell Value, String Constant - xLGLSPCb len=0 
' 0018     27 LABEL : Cell Value, String Constant - YkCLguGXKmdj len=0 
' 0018     22 LABEL : Cell Value, String Constant - zxdIAss 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
... (truncated)

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