Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 057374b8bdd50404…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:50 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 348a7b4be1ca524bc286296735a109ce SHA-1: 6b56dee075a6de8998dc8559750c253e3ec883fa SHA-256: 057374b8bdd504041ba8f14522f860b71647229c2c0a6f93e26e3bba9b745a5a
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 defined name, which is a known technique for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands. No specific family could be identified, but the technique 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) 6827 bytes
SHA-256: 2aa86805d7ce8daa25e0d2de6905ef01e6e6e3bc74db83ab075667806379807a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  cxPkUWbvUi
' 0018     27 LABEL : Cell Value, String Constant - AgWclkcCKgeL len=0 
' 0018     23 LABEL : Cell Value, String Constant - AhMGuqFA len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F136 
' 0018     26 LABEL : Cell Value, String Constant - ckpnreQJPzv len=0 
' 0018     23 LABEL : Cell Value, String Constant - DJsCllMo len=0 
' 0018     23 LABEL : Cell Value, String Constant - gBrCyhTx len=0 
' 0018     26 LABEL : Cell Value, String Constant - gmWYwynnKMF len=0 
' 0018     24 LABEL : Cell Value, String Constant - KpPTxZsuQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - lDKoy len=0 
' 0018     23 LABEL : Cell Value, String Constant - lHCkmgNN len=0 
' 0018     23 LABEL : Cell Value, String Constant - LHYjoSod len=0 
' 0018     22 LABEL : Cell Value, String Constant - oCOEXOb len=0 
' 0018     27 LABEL : Cell Value, String Constant - omxpaxhpyDch len=0 
' 0018     22 LABEL : Cell Value, String Constant - OQWRgFc len=0 
' 0018     24 LABEL : Cell Value, String Constant - PpyCnmVjI len=0 
' 0018     22 LABEL : Cell Value, String Constant - qhplbFE len=0 
' 0018     21 LABEL : Cell Value, String Constant - QSLTdv len=0 
' 0018     23 LABEL : Cell Value, String Constant - saWBCiKv len=0 
' 0018     26 LABEL : Cell Value, String Constant - vdjXnoWRmDq len=0 
' 0018     27 LABEL : Cell Value, String Constant - WSEiyusejTmr len=0 
' 0018     21 LABEL : Cell Value, String Constant - yyqCsT 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
' 0
... (truncated)

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