Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 93937d5bb80fc017…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:41:30 Authoring application: Microsoft Excel First seen: 2021-09-27
MD5: a007048a47b85706d7775ecc24b8e2bc SHA-1: 72838543f6a5aa9dffdb57e915dfd51a6991d306 SHA-256: 93937d5bb80fc017ce383b0a7feb54573ca3ba484c103c83d70f49d025f105f9
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 function. This function is designed to execute automatically when the workbook is opened, indicating a likely attempt to run malicious code. The presence of dangerous formula APIs further supports this assessment. 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) 6500 bytes
SHA-256: e475e73423c7a4db66724e45e495a33c58c98ddae7beaccc4954ffabb7f55524
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  lRFOHa
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C147 
' 0018     23 LABEL : Cell Value, String Constant - CCJhVemB len=0 
' 0018     27 LABEL : Cell Value, String Constant - CCNXedODSHUj len=0 
' 0018     22 LABEL : Cell Value, String Constant - dKmdouJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - DPFky len=0 
' 0018     26 LABEL : Cell Value, String Constant - DZxJZKXDcwL len=0 
' 0018     25 LABEL : Cell Value, String Constant - FHzWcQHnhU len=0 
' 0018     27 LABEL : Cell Value, String Constant - FWwNweivonUM len=0 
' 0018     26 LABEL : Cell Value, String Constant - GkzIgdjaRjw len=0 
' 0018     20 LABEL : Cell Value, String Constant - iAuTq len=0 
' 0018     21 LABEL : Cell Value, String Constant - icKQOJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - IPvxf len=0 
' 0018     21 LABEL : Cell Value, String Constant - JuNlvS len=0 
' 0018     26 LABEL : Cell Value, String Constant - mfAVCxZnDEa len=0 
' 0018     22 LABEL : Cell Value, String Constant - mVdIeax len=0 
' 0018     20 LABEL : Cell Value, String Constant - nnlox len=0 
' 0018     26 LABEL : Cell Value, String Constant - ofHhXXkyXwt len=0 
' 0018     25 LABEL : Cell Value, String Constant - OYygvBNWTq len=0 
' 0018     22 LABEL : Cell Value, String Constant - PJSgeLo len=0 
' 0018     21 LABEL : Cell Value, String Constant - RarUVj len=0 
' 0018     25 LABEL : Cell Value, String Constant - UDqNxksZBT 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 L
... (truncated)

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