Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8ec71361ae875aa0…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:17 Authoring application: Microsoft Excel First seen: 2021-06-17
MD5: cca694ef29e8d08c6f68bb1195c4bc18 SHA-1: 2265ae08e3f69efc41b6f9ab234ebba9d55ec2c0 SHA-256: 8ec71361ae875aa02dc89dfc8cf773a25c95a56d6ded06d068962be0da4eff9f
140 Risk Score

Malware Insights

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

The file is identified as a malicious Excel 4.0 (XLM) macro sheet. Heuristics indicate the presence of an Auto_Open defined name, which is a common technique for automatically executing macros when the workbook is opened. The `RUN` function API is also present, suggesting the macro is designed to execute arbitrary commands or download further payloads.

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) 6585 bytes
SHA-256: ad8aa72ec5f2bfe78f16dbd8674b117378943edfdd589ed1ddbfe780a7dac518
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  iwVyZ
' 0018     22 LABEL : Cell Value, String Constant - ALZyJnc len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C196 
' 0018     24 LABEL : Cell Value, String Constant - bRbhMiidP len=0 
' 0018     21 LABEL : Cell Value, String Constant - CFyEOU len=0 
' 0018     24 LABEL : Cell Value, String Constant - DBLHrhXNT len=0 
' 0018     23 LABEL : Cell Value, String Constant - DNQOqsSv len=0 
' 0018     27 LABEL : Cell Value, String Constant - FAMemjEcSNAH len=0 
' 0018     21 LABEL : Cell Value, String Constant - FVYUkF len=0 
' 0018     20 LABEL : Cell Value, String Constant - HFURw len=0 
' 0018     25 LABEL : Cell Value, String Constant - ipSMfsAWmy len=0 
' 0018     21 LABEL : Cell Value, String Constant - JkDpmz len=0 
' 0018     26 LABEL : Cell Value, String Constant - jWxSKxoqwmX len=0 
' 0018     22 LABEL : Cell Value, String Constant - OpsoYvo len=0 
' 0018     25 LABEL : Cell Value, String Constant - piaqZyHFMW len=0 
' 0018     22 LABEL : Cell Value, String Constant - PJTtceA len=0 
' 0018     25 LABEL : Cell Value, String Constant - RcUbQYIlkB len=0 
' 0018     20 LABEL : Cell Value, String Constant - TLesv len=0 
' 0018     20 LABEL : Cell Value, String Constant - TsUFy len=0 
' 0018     20 LABEL : Cell Value, String Constant - VRcvh len=0 
' 0018     22 LABEL : Cell Value, String Constant - XVVqrif len=0 
' 0018     20 LABEL : Cell Value, String Constant - yuNUq 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 V
... (truncated)

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