Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 213b2986c0048e08…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:32 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: aeb6ef45bf8c0bb21a7e5d79e747c509 SHA-1: bb39870b945d9d97c7ec00ba15d1a4c8ec7d18c8 SHA-256: 213b2986c0048e08b92df171fd4ed349405ab0764e449199a20b9dc43839381c
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook. Static analysis detected an Auto_Open defined name, indicating that macros will execute automatically upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary commands, likely to download and run a second-stage payload.

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) 6366 bytes
SHA-256: 4e3c8306e4bd0af0a79a75219da45510e02c8939cca81ed65935ea7c3cd56c2d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  SfJ
' 0018     25 LABEL : Cell Value, String Constant - AEwHStRbWz len=0 
' 0018     25 LABEL : Cell Value, String Constant - AhICbuHcfU len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G144 
' 0018     23 LABEL : Cell Value, String Constant - bjLTjsDf len=0 
' 0018     24 LABEL : Cell Value, String Constant - huxjfzOkL len=0 
' 0018     27 LABEL : Cell Value, String Constant - hWNMeoxLycol len=0 
' 0018     22 LABEL : Cell Value, String Constant - ibUNbnq len=0 
' 0018     23 LABEL : Cell Value, String Constant - iKAWcZWb len=0 
' 0018     27 LABEL : Cell Value, String Constant - ioPIXlQkIMyi len=0 
' 0018     25 LABEL : Cell Value, String Constant - KbQABwBoBT len=0 
' 0018     27 LABEL : Cell Value, String Constant - lOvTMNaMjtNR len=0 
' 0018     21 LABEL : Cell Value, String Constant - pUBwNq len=0 
' 0018     21 LABEL : Cell Value, String Constant - pzZvRD len=0 
' 0018     24 LABEL : Cell Value, String Constant - QWfcPtTwd len=0 
' 0018     21 LABEL : Cell Value, String Constant - uzzGqu len=0 
' 0018     21 LABEL : Cell Value, String Constant - VVCKuI len=0 
' 0018     20 LABEL : Cell Value, String Constant - xETiT len=0 
' 0018     27 LABEL : Cell Value, String Constant - YqrGWFYhwcRz len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZBuMVzFzfYzD len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZrKerla len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZrpHWX 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    
... (truncated)

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