Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 489847d83fe3ff87…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:55 Authoring application: Microsoft Excel First seen: 2021-09-27
MD5: d230c21dd059d8c3567323f3de695c35 SHA-1: 29fa8502e3efbe94f72093a7a3b9b0d64703c157 SHA-256: 489847d83fe3ff874adf8d03c7b1013ebb333376934ed678a40b33feec33e8b0
140 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro-enabled workbook. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code upon opening the document. The macro sheet contains a reference to a dangerous formula API, specifically 'RUN', suggesting it is designed to execute arbitrary commands.

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) 6404 bytes
SHA-256: c7c5c4ac6d858e86720fe699df960e215aa301ef27c734b90ed97c3029e094a0
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  DagR
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D162 
' 0018     23 LABEL : Cell Value, String Constant - bRsIlYXk len=0 
' 0018     22 LABEL : Cell Value, String Constant - FwzPrgg len=0 
' 0018     25 LABEL : Cell Value, String Constant - gJvxkOiNIh len=0 
' 0018     20 LABEL : Cell Value, String Constant - GZRdQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - IBkBfh len=0 
' 0018     27 LABEL : Cell Value, String Constant - JLfqniPQWZEV len=0 
' 0018     26 LABEL : Cell Value, String Constant - jllTGTcxLlz len=0 
' 0018     27 LABEL : Cell Value, String Constant - JMkzcNVjWSwS len=0 
' 0018     21 LABEL : Cell Value, String Constant - LGQpJV len=0 
' 0018     24 LABEL : Cell Value, String Constant - MtSMxsGEK len=0 
' 0018     22 LABEL : Cell Value, String Constant - NlCMDAm len=0 
' 0018     23 LABEL : Cell Value, String Constant - OKbdQVox len=0 
' 0018     24 LABEL : Cell Value, String Constant - oxDYhxQmB len=0 
' 0018     21 LABEL : Cell Value, String Constant - PISmvi len=0 
' 0018     21 LABEL : Cell Value, String Constant - pYhWLD len=0 
' 0018     27 LABEL : Cell Value, String Constant - QkXiHcItbhtQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - sqidofuKS len=0 
' 0018     27 LABEL : Cell Value, String Constant - VBEksOxfihTN len=0 
' 0018     23 LABEL : Cell Value, String Constant - wAPihNPM len=0 
' 0018     27 LABEL : Cell Value, String Constant - WsDSLtJTrhPN 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 
... (truncated)

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