Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 aa0ed215b901509f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:15 Authoring application: Microsoft Excel First seen: 2021-09-25
MD5: 985e4d4851c58fb9281099d7e26e7f83 SHA-1: cd9e9648d2d6234fc8842c69deb072c3fd3a148e SHA-256: aa0ed215b901509fcbf530164ae09f41c9ef33ed0516ec1e8630fa05d854e239
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 defined name, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely to download and run a secondary payload. The obfuscated document body and truncated script content prevent further analysis of the specific payload.

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) 6514 bytes
SHA-256: 41db9873419f5a224264c1d2a70090e834f2089f18a2f0102a9efc62226ba4b0
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  AZggTXd
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G142 
' 0018     20 LABEL : Cell Value, String Constant - ccpil len=0 
' 0018     23 LABEL : Cell Value, String Constant - cPEjBEFw len=0 
' 0018     23 LABEL : Cell Value, String Constant - cQTAbHfm len=0 
' 0018     23 LABEL : Cell Value, String Constant - CUZgSxXC len=0 
' 0018     26 LABEL : Cell Value, String Constant - GDFtVqDIjoI len=0 
' 0018     20 LABEL : Cell Value, String Constant - JEHUY len=0 
' 0018     27 LABEL : Cell Value, String Constant - jTeBJRPxgoQv len=0 
' 0018     22 LABEL : Cell Value, String Constant - kiJcnNi len=0 
' 0018     23 LABEL : Cell Value, String Constant - LybHomHy len=0 
' 0018     23 LABEL : Cell Value, String Constant - QNnziVxo len=0 
' 0018     21 LABEL : Cell Value, String Constant - qrXjbr len=0 
' 0018     27 LABEL : Cell Value, String Constant - rIppLkPQJIga len=0 
' 0018     24 LABEL : Cell Value, String Constant - RWfJsKMZh len=0 
' 0018     27 LABEL : Cell Value, String Constant - vVapxMvjgaSZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - wjGxfpbuRJx len=0 
' 0018     26 LABEL : Cell Value, String Constant - woyRqQpQHEf len=0 
' 0018     21 LABEL : Cell Value, String Constant - YoLDzr len=0 
' 0018     22 LABEL : Cell Value, String Constant - yzMbEGI len=0 
' 0018     24 LABEL : Cell Value, String Constant - zFLAvRCYH len=0 
' 0018     23 LABEL : Cell Value, String Constant - Ztwyjvgk 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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