Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fe4b36273080f39e…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:14 Authoring application: Microsoft Excel First seen: 2021-09-16
MD5: 376605a7be92b34c743cf1f52dab4405 SHA-1: 9c040de445ace40ba842d46d64cf6a18671ad01e SHA-256: fe4b36273080f39e6d9c6af37d964075fcbb680953d578f2683a8f494bb00ba6
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, which is a common method for executing malicious code upon opening the document. The macro sheet contains references to dangerous formula APIs, including RUN, suggesting it is designed to execute arbitrary commands. No specific family could be identified, and no external IOCs were extracted.

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) 6551 bytes
SHA-256: 0cc4df17e1e0cca25c142b04303a3684edb1fc88620a37c8be6967a7f733511a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  JzqmzcDJX
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G132 
' 0018     21 LABEL : Cell Value, String Constant - axzDlD len=0 
' 0018     25 LABEL : Cell Value, String Constant - bZpJXZRdGJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - CANAvmoW len=0 
' 0018     20 LABEL : Cell Value, String Constant - CguHx len=0 
' 0018     22 LABEL : Cell Value, String Constant - CgWdKYW len=0 
' 0018     25 LABEL : Cell Value, String Constant - EIFyGtRdfG len=0 
' 0018     27 LABEL : Cell Value, String Constant - ENGKQZmhiyOW len=0 
' 0018     21 LABEL : Cell Value, String Constant - frZjQg len=0 
' 0018     26 LABEL : Cell Value, String Constant - fSMhBcLqJdO len=0 
' 0018     23 LABEL : Cell Value, String Constant - fUuXekiC len=0 
' 0018     20 LABEL : Cell Value, String Constant - hegzi len=0 
' 0018     20 LABEL : Cell Value, String Constant - HtOno len=0 
' 0018     27 LABEL : Cell Value, String Constant - JdriXpIUxHoc len=0 
' 0018     26 LABEL : Cell Value, String Constant - raSjCyJDNZS len=0 
' 0018     21 LABEL : Cell Value, String Constant - rQjciB len=0 
' 0018     26 LABEL : Cell Value, String Constant - tOFbAVygRdN len=0 
' 0018     26 LABEL : Cell Value, String Constant - UVgdGCzYWAn len=0 
' 0018     27 LABEL : Cell Value, String Constant - zjUQqtLyAaeJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZjzHzP len=0 
' 0018     21 LABEL : Cell Value, String Constant - znrFwV 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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