Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 295e770524808e2c…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:42:18 Authoring application: Microsoft Excel First seen: 2021-10-11
MD5: 3331920b18d433b513b3493cd0ebebf9 SHA-1: 8b1bd95c681a1bc94a17796f8ff7bc617a75bda5 SHA-256: 295e770524808e2cd915fb70289041c15dee958c457e583951087b85da9934d1
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 sheet that contains an Auto_Open defined name, indicating it will execute automatically upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary commands. The specific function used, RUN, is a critical indicator of malicious intent for command execution.

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) 6527 bytes
SHA-256: 17a8ea38d3998b565d8ad27e823da0dc82cf50d305543b2db72f630295ab9a53
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  WuDjWoQN
' 0018     22 LABEL : Cell Value, String Constant - AQAnjaZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H163 
' 0018     20 LABEL : Cell Value, String Constant - CUwYM len=0 
' 0018     22 LABEL : Cell Value, String Constant - fNwQzfa len=0 
' 0018     27 LABEL : Cell Value, String Constant - HeOsKOlWngxu len=0 
' 0018     21 LABEL : Cell Value, String Constant - hgaJYo len=0 
' 0018     25 LABEL : Cell Value, String Constant - JnvCRXwghn len=0 
' 0018     26 LABEL : Cell Value, String Constant - kFKQxXGftSO len=0 
' 0018     24 LABEL : Cell Value, String Constant - oMxYTeByq len=0 
' 0018     26 LABEL : Cell Value, String Constant - PIyrxXOwJCf len=0 
' 0018     23 LABEL : Cell Value, String Constant - PNSsAiLf len=0 
' 0018     25 LABEL : Cell Value, String Constant - RefEnFrJQF len=0 
' 0018     21 LABEL : Cell Value, String Constant - RoOEVk len=0 
' 0018     22 LABEL : Cell Value, String Constant - rvyssnZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - sVvFgdleyZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - XRyTo len=0 
' 0018     22 LABEL : Cell Value, String Constant - yBTScIX len=0 
' 0018     23 LABEL : Cell Value, String Constant - yyMGNFUR len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZLvTMQpXYFiU len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZtYfMuuiHONF len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZWBSZp 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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