Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 91e7b2f1f25394a9…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:42:29 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: e82e3f2e8ff015944c30a52175d74c79 SHA-1: ccac11e02b95476d128530ae9d765634b87692be SHA-256: 91e7b2f1f25394a9062b3e91245469ee49fb741cd7445cb9747f2d9b9686d608
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known method for executing malicious code within Excel documents. The critical heuristic firings indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting an attempt to exploit the application for client execution. No specific family could be identified, and no direct IOCs like URLs or hashes were extracted from the macro content.

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) 6886 bytes
SHA-256: fbefb4607bcbc157cada04594be6dbc19eb15b86609a57f08a45ef24b30053ae
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 -  dcsbFhEAlq
' 0018     27 LABEL : Cell Value, String Constant - ABqkmEXwLmLd len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C147 
' 0018     20 LABEL : Cell Value, String Constant - DvRUU len=0 
' 0018     22 LABEL : Cell Value, String Constant - epedZTP len=0 
' 0018     26 LABEL : Cell Value, String Constant - fjYnzVHnBKQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - fzAbjHsu len=0 
' 0018     21 LABEL : Cell Value, String Constant - jTtjQC len=0 
' 0018     24 LABEL : Cell Value, String Constant - kBgjfegvu len=0 
' 0018     21 LABEL : Cell Value, String Constant - kWSPrE len=0 
' 0018     27 LABEL : Cell Value, String Constant - MJGpnnClAkcv len=0 
' 0018     20 LABEL : Cell Value, String Constant - msCrp len=0 
' 0018     26 LABEL : Cell Value, String Constant - nYyewgkHgir len=0 
' 0018     22 LABEL : Cell Value, String Constant - qKUiZyt len=0 
' 0018     26 LABEL : Cell Value, String Constant - TCwvmyEKnVG len=0 
' 0018     23 LABEL : Cell Value, String Constant - wFKPnzPb len=0 
' 0018     24 LABEL : Cell Value, String Constant - WypzOjdFw len=0 
' 0018     23 LABEL : Cell Value, String Constant - xWxOPGrj len=0 
' 0018     24 LABEL : Cell Value, String Constant - YFesGJuDr len=0 
' 0018     27 LABEL : Cell Value, String Constant - YONMMzcpWbOA len=0 
' 0018     20 LABEL : Cell Value, String Constant - YuSPe len=0 
' 0018     24 LABEL : Cell Value, String Constant - zzMYwQiVA 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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