Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1db8b061d3f36f61…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:46 Authoring application: Microsoft Excel First seen: 2021-06-30
MD5: 1844ba5a739b423df80892d2d490a59c SHA-1: 9b19fe6345d86bb45641ee2572ff40b8f33a6833 SHA-256: 1db8b061d3f36f617c6ea10f3b77a326219e8eb8db9088e6c180d7f217de9d5d
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 potential for automatic execution upon opening. The presence of dangerous formula APIs like RUN further supports the likelihood that this macro is designed to execute arbitrary code, such as downloading and running a second-stage payload. No specific family could be identified, but the technique is commonly used for initial compromise.

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) 6704 bytes
SHA-256: c5200dcbb60f45e1ab32f54129a3ba0da397e79a2165b7a469aa34ed9378123b
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  rtpAiFOhgAk
' 0018     23 LABEL : Cell Value, String Constant - APgeqaXW len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H142 
' 0018     27 LABEL : Cell Value, String Constant - CbpgHUWlZePE len=0 
' 0018     25 LABEL : Cell Value, String Constant - coJIxBrzGT len=0 
' 0018     20 LABEL : Cell Value, String Constant - Eaorr len=0 
' 0018     25 LABEL : Cell Value, String Constant - eEtPxNIaem len=0 
' 0018     21 LABEL : Cell Value, String Constant - FNstPc len=0 
' 0018     27 LABEL : Cell Value, String Constant - gWExfYaMzcti len=0 
' 0018     23 LABEL : Cell Value, String Constant - iDLINAwq len=0 
' 0018     24 LABEL : Cell Value, String Constant - jpwqRiLuK len=0 
' 0018     22 LABEL : Cell Value, String Constant - kKZgnMg len=0 
' 0018     21 LABEL : Cell Value, String Constant - McBLTY len=0 
' 0018     23 LABEL : Cell Value, String Constant - NArUeouK len=0 
' 0018     24 LABEL : Cell Value, String Constant - NidEtDaJq len=0 
' 0018     24 LABEL : Cell Value, String Constant - QBdFaxTyD len=0 
' 0018     23 LABEL : Cell Value, String Constant - qlZkCSIo len=0 
' 0018     24 LABEL : Cell Value, String Constant - UFFzNganh len=0 
' 0018     26 LABEL : Cell Value, String Constant - UkGqkgRVGdV len=0 
' 0018     24 LABEL : Cell Value, String Constant - uRDzODkzH len=0 
' 0018     20 LABEL : Cell Value, String Constant - VtnvC len=0 
' 0018     25 LABEL : Cell Value, String Constant - zxBHTpGOoE 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
' 00
... (truncated)

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