Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d2aeca64f9f81cbf…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:45:55 Authoring application: Microsoft Excel First seen: 2021-09-18
MD5: feb92098262f8ac5e87219562bcbdc36 SHA-1: 961b4d5432f54afdcd5ab963ec7a4afccded9b68 SHA-256: d2aeca64f9f81cbff8da65352507f5a81965afa411901fa695161045bdb4a84f
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled document. Heuristics indicate the presence of an Auto_Open macro and the use of dangerous formula APIs, suggesting it's designed to execute code upon opening. The macro sheet itself contains obfuscated data, but the critical firings strongly suggest a malicious intent to run 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) 6763 bytes
SHA-256: fdfe6e926b3564a9a455d9a0e23dd805190c61df4d03b1f8315302a8af432a24
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 -  oNirgv
' 0018     27 LABEL : Cell Value, String Constant - aCHKBYlfYLPr len=0 
' 0018     27 LABEL : Cell Value, String Constant - aDRdYDkzmzVx len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I143 
' 0018     22 LABEL : Cell Value, String Constant - CJEytdo len=0 
' 0018     22 LABEL : Cell Value, String Constant - dcJwUgX len=0 
' 0018     27 LABEL : Cell Value, String Constant - FGrpGEvNgkvk len=0 
' 0018     24 LABEL : Cell Value, String Constant - hjnxEVfcD len=0 
' 0018     25 LABEL : Cell Value, String Constant - hrPWYVRGNb len=0 
' 0018     25 LABEL : Cell Value, String Constant - jgzPRWdlrb len=0 
' 0018     23 LABEL : Cell Value, String Constant - JyNqRIhE len=0 
' 0018     22 LABEL : Cell Value, String Constant - kMiObad len=0 
' 0018     24 LABEL : Cell Value, String Constant - nFzISnPwM len=0 
' 0018     24 LABEL : Cell Value, String Constant - PNrSoWfHs len=0 
' 0018     27 LABEL : Cell Value, String Constant - ppWEOgNiQrFI len=0 
' 0018     27 LABEL : Cell Value, String Constant - QYtovWnMkaqo len=0 
' 0018     23 LABEL : Cell Value, String Constant - rLJGKcxc len=0 
' 0018     24 LABEL : Cell Value, String Constant - VkzCEUDTq len=0 
' 0018     26 LABEL : Cell Value, String Constant - VnSCfIUXhIF len=0 
' 0018     20 LABEL : Cell Value, String Constant - xjlsk len=0 
' 0018     20 LABEL : Cell Value, String Constant - XwacA len=0 
' 0018     26 LABEL : Cell Value, String Constant - zxAVuhwOdsw 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/
... (truncated)

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