Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2ef6ccd436d109e3…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:01 Authoring application: Microsoft Excel First seen: 2021-09-29
MD5: 9eb1d47dbaa9b5dc85ad3c6f699e2796 SHA-1: bc47b8a3f07785381859bbd166fefb7f433a0c72 SHA-256: 2ef6ccd436d109e340b718cb7181fe8eb89bea145d3afa440ddfff944e3a1390
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, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics. The presence of an Auto_Open defined name suggests that the macro will execute automatically upon opening the workbook. The dangerous formula APIs used in the macro indicate an intent to execute arbitrary code, likely to download and run a secondary payload. No specific family could be identified.

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) 6668 bytes
SHA-256: 3b9eb7a43316eaaac33f5d627b5bb0fbb90fe052d65f0ff5428dd44856138ead
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 -  BRLomOMpJA
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G193 
' 0018     21 LABEL : Cell Value, String Constant - egeteQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - EHpTLK len=0 
' 0018     27 LABEL : Cell Value, String Constant - fjKJljZXgjHo len=0 
' 0018     22 LABEL : Cell Value, String Constant - GAwoxED len=0 
' 0018     23 LABEL : Cell Value, String Constant - GttGxPMP len=0 
' 0018     26 LABEL : Cell Value, String Constant - hxUgbFBqlNz len=0 
' 0018     20 LABEL : Cell Value, String Constant - IOwVu len=0 
' 0018     23 LABEL : Cell Value, String Constant - jdmLjtOb len=0 
' 0018     20 LABEL : Cell Value, String Constant - jiZgz len=0 
' 0018     27 LABEL : Cell Value, String Constant - nDZQLeTxjCZc len=0 
' 0018     25 LABEL : Cell Value, String Constant - OOTaezQTbq len=0 
' 0018     21 LABEL : Cell Value, String Constant - OoUCdm len=0 
' 0018     27 LABEL : Cell Value, String Constant - qpogrMUGQZJh len=0 
' 0018     22 LABEL : Cell Value, String Constant - QRqkfOU len=0 
' 0018     22 LABEL : Cell Value, String Constant - SbbkzXL len=0 
' 0018     24 LABEL : Cell Value, String Constant - TcuRvLsHK len=0 
' 0018     23 LABEL : Cell Value, String Constant - vpLFZGMI len=0 
' 0018     22 LABEL : Cell Value, String Constant - wFFNWbU len=0 
' 0018     23 LABEL : Cell Value, String Constant - XTYeFKnI len=0 
' 0018     25 LABEL : Cell Value, String Constant - yBNuqoUTMH 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     1
... (truncated)

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