Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1e7ce1beaddc3d05…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:40:47 Authoring application: Microsoft Excel First seen: 2021-11-02
MD5: 55df248f585f4f853766cc9c8075d781 SHA-1: 54781c08d55ea327d1abb34d3d8cc17d2976f6e0 SHA-256: 1e7ce1beaddc3d057c544953664bdce238b79951f0585699e525bc1ea4fdf6bc
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) 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 a downloader for a second-stage payload. No specific family could be identified from the available evidence.

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) 6435 bytes
SHA-256: 07148b4b0d1122a6eb989966d3c7c15a02d7f91566f8c1c7bf4f700b7afc7e3e
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 -  RiH
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C142 
' 0018     20 LABEL : Cell Value, String Constant - Avtol len=0 
' 0018     25 LABEL : Cell Value, String Constant - bAWlvHJIkp len=0 
' 0018     27 LABEL : Cell Value, String Constant - CBpuWTibNjbZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - cfuvFOhy len=0 
' 0018     21 LABEL : Cell Value, String Constant - cpatnW len=0 
' 0018     22 LABEL : Cell Value, String Constant - CYAODkx len=0 
' 0018     25 LABEL : Cell Value, String Constant - eQKiNXkEjc len=0 
' 0018     27 LABEL : Cell Value, String Constant - HepvjHkSVtdZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - jWRJncKtbAhO len=0 
' 0018     26 LABEL : Cell Value, String Constant - jYPgrLSrfYg len=0 
' 0018     20 LABEL : Cell Value, String Constant - POFDN len=0 
' 0018     23 LABEL : Cell Value, String Constant - qiCOmEyG len=0 
' 0018     25 LABEL : Cell Value, String Constant - sDMMsDbzyc len=0 
' 0018     26 LABEL : Cell Value, String Constant - uKUWNaiXjIO len=0 
' 0018     20 LABEL : Cell Value, String Constant - uoKth len=0 
' 0018     23 LABEL : Cell Value, String Constant - VCSdxvcY len=0 
' 0018     25 LABEL : Cell Value, String Constant - wDQowRPawy len=0 
' 0018     24 LABEL : Cell Value, String Constant - XJqcgEjTw len=0 
' 0018     21 LABEL : Cell Value, String Constant - yUGwGX len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZoahAj 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     1
... (truncated)

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