Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 96ecbd65f7e241b2…

MALICIOUS

Office (OLE)

37.0 KB Created: 2020-11-25 10:42:34 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 3d08376e4a8825806015477048c40e38 SHA-1: 7f32e61f459a3d62a3dc089827fbe489c1d014b2 SHA-256: 96ecbd65f7e241b23bb5e1fcc61df565c5b765e2d7b35f58e1ffb8fc66dd0794
140 Risk Score

Malware Insights

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

The file is an Excel document containing Excel 4.0 macros, specifically an Auto_Open macro. This macro is designed to execute arbitrary commands, indicated by the 'RUN=0' heuristic firing and the presence of dangerous formula APIs. The macro likely serves as a downloader for a secondary payload, although the specific payload or destination is not evident from the static analysis.

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) 6676 bytes
SHA-256: 88767de8dbadfc1e825b64cb092fa6b2135491c24393baaf13c2cb35ff056be8
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  AcsYxOc
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G136 
' 0018     27 LABEL : Cell Value, String Constant - ayzFUvroktMy len=0 
' 0018     24 LABEL : Cell Value, String Constant - bTECVDUwH len=0 
' 0018     24 LABEL : Cell Value, String Constant - BTENgNAJo len=0 
' 0018     27 LABEL : Cell Value, String Constant - DISMQbsJlFAA len=0 
' 0018     25 LABEL : Cell Value, String Constant - DvzCLGOvGu len=0 
' 0018     27 LABEL : Cell Value, String Constant - HCveIbRVlkWd len=0 
' 0018     25 LABEL : Cell Value, String Constant - HoynQrsbmr len=0 
' 0018     23 LABEL : Cell Value, String Constant - jOXVLdlk len=0 
' 0018     27 LABEL : Cell Value, String Constant - JyYKqNDFcudx len=0 
' 0018     25 LABEL : Cell Value, String Constant - kJFeTkKnaH len=0 
' 0018     25 LABEL : Cell Value, String Constant - lgnKxiamET len=0 
' 0018     24 LABEL : Cell Value, String Constant - mbCCdFWpL len=0 
' 0018     24 LABEL : Cell Value, String Constant - OANgTXflX len=0 
' 0018     20 LABEL : Cell Value, String Constant - OQkYt len=0 
' 0018     24 LABEL : Cell Value, String Constant - RCbRaPhEw len=0 
' 0018     23 LABEL : Cell Value, String Constant - rEMECXTd len=0 
' 0018     26 LABEL : Cell Value, String Constant - tmvjBDbQHaO len=0 
' 0018     22 LABEL : Cell Value, String Constant - tYaCFBL len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZfZcy len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZvStLxSK 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
... (truncated)

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