Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5e22add62010ed3a…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:56 Authoring application: Microsoft Excel First seen: 2021-07-13
MD5: 09611d42a12445e3d55131f9722f1f22 SHA-1: cf8728f2cd1725ece2c44de2e17c7ebf7a1a8461 SHA-256: 5e22add62010ed3aceecb5085f69c1e278c3363dc55e509e812d7be143e9a1e5
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known method for executing malicious code within spreadsheets. The critical heuristics indicate the presence of dangerous formula APIs like RUN=0, suggesting the macro is designed to execute arbitrary commands or download further payloads. Without further script content, the exact payload and execution chain remain unknown.

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) 6590 bytes
SHA-256: 5443988bd91d9041b5d2c432cf2f54eca38d84eaf80a98b49569c70574031284
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 -  GQnPzYcL
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C139 
' 0018     22 LABEL : Cell Value, String Constant - BRGzXnb len=0 
' 0018     25 LABEL : Cell Value, String Constant - BTtgjSFJLL len=0 
' 0018     21 LABEL : Cell Value, String Constant - DOlPHG len=0 
' 0018     23 LABEL : Cell Value, String Constant - EsPOhkeh len=0 
' 0018     26 LABEL : Cell Value, String Constant - gAlajtNxrNj len=0 
' 0018     25 LABEL : Cell Value, String Constant - gFjTdpFoOW len=0 
' 0018     25 LABEL : Cell Value, String Constant - kjpccqXlFR len=0 
' 0018     27 LABEL : Cell Value, String Constant - LjXXVlCiJMId len=0 
' 0018     27 LABEL : Cell Value, String Constant - lOZlPKDpPgCn len=0 
' 0018     26 LABEL : Cell Value, String Constant - ozhKvMBKVHH len=0 
' 0018     20 LABEL : Cell Value, String Constant - PAZGE len=0 
' 0018     23 LABEL : Cell Value, String Constant - plHupZyB len=0 
' 0018     27 LABEL : Cell Value, String Constant - pljQBspnYAJN len=0 
' 0018     27 LABEL : Cell Value, String Constant - QdcVgYNiKKQS len=0 
' 0018     25 LABEL : Cell Value, String Constant - qEbvDjmGSr len=0 
' 0018     23 LABEL : Cell Value, String Constant - qSHsGusT len=0 
' 0018     23 LABEL : Cell Value, String Constant - SRmxbEak len=0 
' 0018     25 LABEL : Cell Value, String Constant - trxhjcsUzN len=0 
' 0018     24 LABEL : Cell Value, String Constant - vvPYFzbAe len=0 
' 0018     23 LABEL : Cell Value, String Constant - wJKiSTRU 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 Const
... (truncated)

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