Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 308617e7721e9f42…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:40:30 Authoring application: Microsoft Excel First seen: 2021-09-15
MD5: f3a4114d5339de513d32955751c02b25 SHA-1: 62261891deb0a784f884da6610c75776e61745f2 SHA-256: 308617e7721e9f4231c6abae8c8e1f33431c8314b37b6c6cf82c27ca08fa3d3d
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. This indicates the file is designed to automatically execute malicious code upon opening. The presence of dangerous formula APIs further supports the malicious intent, suggesting the macros are used to run arbitrary commands.

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) 6715 bytes
SHA-256: 41c3ff459bc694acc15967a70b07172f2dceae6b1d4a476987dec8dd9397c4ad
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 -  ejNnTXr
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A184 
' 0018     23 LABEL : Cell Value, String Constant - FRWzsmaj len=0 
' 0018     26 LABEL : Cell Value, String Constant - gPBTdSoBdoX len=0 
' 0018     20 LABEL : Cell Value, String Constant - hrkVC len=0 
' 0018     21 LABEL : Cell Value, String Constant - jyQoPi len=0 
' 0018     25 LABEL : Cell Value, String Constant - jzyXdFWUKb len=0 
' 0018     24 LABEL : Cell Value, String Constant - LeECdNRFq len=0 
' 0018     26 LABEL : Cell Value, String Constant - lMpkwBPUyoA len=0 
' 0018     21 LABEL : Cell Value, String Constant - mfvvRo len=0 
' 0018     26 LABEL : Cell Value, String Constant - MsvUsfYGWZe len=0 
' 0018     23 LABEL : Cell Value, String Constant - OohcMtsW len=0 
' 0018     26 LABEL : Cell Value, String Constant - OzBSBwtYxyz len=0 
' 0018     25 LABEL : Cell Value, String Constant - PnjEdDyyaq len=0 
' 0018     20 LABEL : Cell Value, String Constant - pREtE len=0 
' 0018     27 LABEL : Cell Value, String Constant - qBBHLgxDpeqC len=0 
' 0018     24 LABEL : Cell Value, String Constant - sWpXgcocC len=0 
' 0018     22 LABEL : Cell Value, String Constant - tbcrCcR len=0 
' 0018     26 LABEL : Cell Value, String Constant - VRYbOhEPqNp len=0 
' 0018     20 LABEL : Cell Value, String Constant - wONzO len=0 
' 0018     26 LABEL : Cell Value, String Constant - WStissgjNZM len=0 
' 0018     22 LABEL : Cell Value, String Constant - WXLpNgF 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)

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