Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4da7499a11ca39ea…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:47 Authoring application: Microsoft Excel First seen: 2021-09-25
MD5: 487e66f67656c943c2204c6862cd7c33 SHA-1: 952d66ee856ffaed800dd6e63d34cbdc244bcc57 SHA-256: 4da7499a11ca39ea53c8f23ffc77ed9788fbce635b0edffce4b94b3d1c356aa7
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 downloading and running 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) 6773 bytes
SHA-256: cbc0a149aa13787cddef37f94a2fc89e02d22e8a920ea3c5a7d70a69b7d79c44
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 -  AqqyRpSV
' 0018     26 LABEL : Cell Value, String Constant - aHlhNleNNcU len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D146 
' 0018     27 LABEL : Cell Value, String Constant - DLYxkFiSPPKO len=0 
' 0018     26 LABEL : Cell Value, String Constant - eCXOdYpSYIo len=0 
' 0018     20 LABEL : Cell Value, String Constant - gjYNO len=0 
' 0018     20 LABEL : Cell Value, String Constant - INeHH len=0 
' 0018     25 LABEL : Cell Value, String Constant - InVuznfXni len=0 
' 0018     20 LABEL : Cell Value, String Constant - IvsNs len=0 
' 0018     23 LABEL : Cell Value, String Constant - KbBUBBRp len=0 
' 0018     21 LABEL : Cell Value, String Constant - KfMAYe len=0 
' 0018     23 LABEL : Cell Value, String Constant - nmlciKzH len=0 
' 0018     25 LABEL : Cell Value, String Constant - obXPUcOOVb len=0 
' 0018     25 LABEL : Cell Value, String Constant - puYavUsbXF len=0 
' 0018     21 LABEL : Cell Value, String Constant - qPqrlD len=0 
' 0018     23 LABEL : Cell Value, String Constant - TkheLkzt len=0 
' 0018     21 LABEL : Cell Value, String Constant - TWkJHi len=0 
' 0018     21 LABEL : Cell Value, String Constant - uaAgcj len=0 
' 0018     24 LABEL : Cell Value, String Constant - XZeefkHOx len=0 
' 0018     21 LABEL : Cell Value, String Constant - YqvERL len=0 
' 0018     20 LABEL : Cell Value, String Constant - YuDLV len=0 
' 0018     27 LABEL : Cell Value, String Constant - yUFifcaLkyeS 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)

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