Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4c1953b63ca61781…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:37:52 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: 4c914a0f984c44cc5402e83210ccb130 SHA-1: 66ff59001c4f1e240cbb1bcbac9cd620ed8cff61 SHA-256: 4c1953b63ca61781bcbce5c19cbcc11defca933107627ffd50d27d7fd1f50749
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 commands, likely to download and run 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) 6753 bytes
SHA-256: 2b45e93b799318465d8fee3ebb118523aa47a956347f723e3c62d47c7ad2216c
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  yjEcHKRh
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D136 
' 0018     27 LABEL : Cell Value, String Constant - bGxmdnZNDEkB len=0 
' 0018     24 LABEL : Cell Value, String Constant - ChSNMZbRw len=0 
' 0018     23 LABEL : Cell Value, String Constant - GEKHzEbC len=0 
' 0018     22 LABEL : Cell Value, String Constant - Gnlfdvb len=0 
' 0018     21 LABEL : Cell Value, String Constant - GOONVd len=0 
' 0018     26 LABEL : Cell Value, String Constant - JKOoTkOzBNm len=0 
' 0018     21 LABEL : Cell Value, String Constant - lSSGHN len=0 
' 0018     23 LABEL : Cell Value, String Constant - ottVdXcX len=0 
' 0018     24 LABEL : Cell Value, String Constant - OuCKKIbAB len=0 
' 0018     21 LABEL : Cell Value, String Constant - QsKiCd len=0 
' 0018     27 LABEL : Cell Value, String Constant - TSBcwnxMlOKB len=0 
' 0018     25 LABEL : Cell Value, String Constant - TxvSiGzGXf len=0 
' 0018     22 LABEL : Cell Value, String Constant - UAjmCNP len=0 
' 0018     26 LABEL : Cell Value, String Constant - uGIRTFlMube len=0 
' 0018     22 LABEL : Cell Value, String Constant - UTRRVRp len=0 
' 0018     26 LABEL : Cell Value, String Constant - vdOmggcDKLq len=0 
' 0018     22 LABEL : Cell Value, String Constant - WzaoCCy len=0 
' 0018     23 LABEL : Cell Value, String Constant - yzwTXfyU len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZEapKdcfJkao len=0 
' 0018     24 LABEL : Cell Value, String Constant - zxChJSkMZ 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
' 
... (truncated)

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