Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 944e97a78fab03f5…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:10 Authoring application: Microsoft Excel First seen: 2021-07-02
MD5: 5b04babaf440ecbbdc2f446d7e03846c SHA-1: ecf63d07d774433eba9a7da0dc18e49cb8b50cf0 SHA-256: 944e97a78fab03f578bfd64f760d0b8500b1a5f28d44c8eefcbae8d8a18ad808
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. The critical heuristics indicate the presence of dangerous formula APIs within the macro, suggesting it's designed to run arbitrary commands. The macro sheet itself contains obfuscated strings and potentially malicious formulas, but no direct URLs or executable commands 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) 6350 bytes
SHA-256: ee8369b5a81fddb5ed07cc906bc5151d5128c01ec113878d9be45e26245da756
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Bjd
' 0018     23 LABEL : Cell Value, String Constant - afxQsDMa len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H180 
' 0018     20 LABEL : Cell Value, String Constant - AXUek len=0 
' 0018     27 LABEL : Cell Value, String Constant - cbtrvnyVZOsP len=0 
' 0018     26 LABEL : Cell Value, String Constant - fPLByFNoFRZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - GgOrymZsJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - HtsGpuTRWW len=0 
' 0018     26 LABEL : Cell Value, String Constant - hzMzYARXtPW len=0 
' 0018     20 LABEL : Cell Value, String Constant - kwDeG len=0 
' 0018     23 LABEL : Cell Value, String Constant - KzzTebhV len=0 
' 0018     20 LABEL : Cell Value, String Constant - LXRJf len=0 
' 0018     20 LABEL : Cell Value, String Constant - ohlOC len=0 
' 0018     21 LABEL : Cell Value, String Constant - oXwiuB len=0 
' 0018     25 LABEL : Cell Value, String Constant - RZOEyIzarC len=0 
' 0018     22 LABEL : Cell Value, String Constant - sjgFmJa len=0 
' 0018     23 LABEL : Cell Value, String Constant - toARRWlO len=0 
' 0018     25 LABEL : Cell Value, String Constant - VZbZLsfbVH len=0 
' 0018     25 LABEL : Cell Value, String Constant - WiTANglGQc len=0 
' 0018     22 LABEL : Cell Value, String Constant - WUReCXV len=0 
' 0018     27 LABEL : Cell Value, String Constant - XTwyalGaNlBg len=0 
' 0018     20 LABEL : Cell Value, String Constant - ySLDk 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     10 LABEL
... (truncated)

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