Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a077527193dca773…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:44 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 194e3690515cb09e7a84688ee0db6599 SHA-1: e76a9b79369dc1156cd9c5e9e470acc027e88bda SHA-256: a077527193dca773b71681a7050db4c01413d38f5e48d48cdea0730ed584c4b2
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro sheet containing an Auto_Open function, which is a critical finding indicating automatic execution upon opening. This function is known to be used for downloading and executing malicious payloads. The presence of dangerous formula APIs further supports this assessment.

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) 6499 bytes
SHA-256: 8b1ad78c13dbee92d6a60e4de6be56f9081cc9bd82b88956becf099814075cc9
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 -  WRJ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I153 
' 0018     20 LABEL : Cell Value, String Constant - cODqc len=0 
' 0018     20 LABEL : Cell Value, String Constant - CokZd len=0 
' 0018     27 LABEL : Cell Value, String Constant - EGLLokyLYtzo len=0 
' 0018     24 LABEL : Cell Value, String Constant - fRQMRiiUn len=0 
' 0018     24 LABEL : Cell Value, String Constant - HZOmwTHKv len=0 
' 0018     24 LABEL : Cell Value, String Constant - jJPGfFWIL len=0 
' 0018     22 LABEL : Cell Value, String Constant - KGDhpdd len=0 
' 0018     25 LABEL : Cell Value, String Constant - mLlVNzssEG len=0 
' 0018     22 LABEL : Cell Value, String Constant - mzkRoNB len=0 
' 0018     20 LABEL : Cell Value, String Constant - Pierp len=0 
' 0018     22 LABEL : Cell Value, String Constant - PjBIjRH len=0 
' 0018     23 LABEL : Cell Value, String Constant - qdpDLEyD len=0 
' 0018     22 LABEL : Cell Value, String Constant - qoVpiCZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - qvdlb len=0 
' 0018     24 LABEL : Cell Value, String Constant - tAWxbmiOT len=0 
' 0018     22 LABEL : Cell Value, String Constant - uLdcpFR len=0 
' 0018     24 LABEL : Cell Value, String Constant - uwVnTjFtN len=0 
' 0018     22 LABEL : Cell Value, String Constant - WbjNdhk len=0 
' 0018     23 LABEL : Cell Value, String Constant - wLbnEREh len=0 
' 0018     22 LABEL : Cell Value, String Constant - XpsYunZ 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 LABELSST : Cell V
... (truncated)

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