Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2cce7f037cdfb1a7…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:39:28 Authoring application: Microsoft Excel First seen: 2021-06-30
MD5: a49305662285fb1425d4f477c68ff44c SHA-1: 4c1bfda1b6423cd2160a195566939bb7d5c82955 SHA-256: 2cce7f037cdfb1a71298a933fd1ba742b235b8a787865ffb68ece099e252fdfa
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is an Excel document containing Excel 4.0 macros, specifically an Auto_Open function, which is a known technique for executing malicious code upon opening. The critical heuristics indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting an intent to perform harmful actions. While the exact payload is not discernible from the provided evidence, the presence of an Auto_Open macro strongly implies an attempt to execute arbitrary code, likely delivered as a spearphishing attachment.

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) 6828 bytes
SHA-256: e340e0793bcf940ecd0592f6d8b033c894e5a6f61d7568e242418e2c4a5a6f11
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 -  SjqmPLcxVs
' 0018     26 LABEL : Cell Value, String Constant - ApUwMDJeEwy len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B163 
' 0018     22 LABEL : Cell Value, String Constant - fdDlpLk len=0 
' 0018     26 LABEL : Cell Value, String Constant - KlNocluoYur len=0 
' 0018     20 LABEL : Cell Value, String Constant - LRjRT len=0 
' 0018     21 LABEL : Cell Value, String Constant - NMlQTv len=0 
' 0018     21 LABEL : Cell Value, String Constant - OakgRo len=0 
' 0018     20 LABEL : Cell Value, String Constant - OkONf len=0 
' 0018     26 LABEL : Cell Value, String Constant - OOeAltAjPsh len=0 
' 0018     26 LABEL : Cell Value, String Constant - pAHJseigEKg len=0 
' 0018     22 LABEL : Cell Value, String Constant - PgsDUMP len=0 
' 0018     25 LABEL : Cell Value, String Constant - qrlJBHCfZB len=0 
' 0018     26 LABEL : Cell Value, String Constant - suogtveNYsd len=0 
' 0018     25 LABEL : Cell Value, String Constant - TOtgjWVgtB len=0 
' 0018     22 LABEL : Cell Value, String Constant - WGOGMLd len=0 
' 0018     24 LABEL : Cell Value, String Constant - whnxeTeSg len=0 
' 0018     27 LABEL : Cell Value, String Constant - wVhpYketSpPL len=0 
' 0018     22 LABEL : Cell Value, String Constant - wYufcgI len=0 
' 0018     20 LABEL : Cell Value, String Constant - XbCNs len=0 
' 0018     24 LABEL : Cell Value, String Constant - zmGdeqCgl len=0 
' 0018     24 LABEL : Cell Value, String Constant - zvXLrydOC 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)

Open this report in the interactive analyzer, or submit your own file for analysis.