Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9b71de8164865361…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:47:30 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: f528ddd91b5c678b36445a58fdf09567 SHA-1: 1bdf46a38b0725e8c729e588d269bec6a81207f8 SHA-256: 9b71de8164865361f3a09a44791edfa05b69edf36578763ddcc97f228c6d4169
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 suggests that 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) 6691 bytes
SHA-256: 89982f541aaf6613c4a947359c06e45a544456963b60dd203c3ae292f682909e
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 -  AKpWEcp
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I164 
' 0018     23 LABEL : Cell Value, String Constant - BNiwgGhg len=0 
' 0018     20 LABEL : Cell Value, String Constant - bVThs len=0 
' 0018     26 LABEL : Cell Value, String Constant - BzZkbhlcSMB len=0 
' 0018     23 LABEL : Cell Value, String Constant - DQzSEvOl len=0 
' 0018     27 LABEL : Cell Value, String Constant - FZtZwMtSnFIe len=0 
' 0018     26 LABEL : Cell Value, String Constant - GtxcbDqwAwm len=0 
' 0018     20 LABEL : Cell Value, String Constant - hHYFo len=0 
' 0018     26 LABEL : Cell Value, String Constant - iZYnrpqumfg len=0 
' 0018     24 LABEL : Cell Value, String Constant - jDiineGLr len=0 
' 0018     20 LABEL : Cell Value, String Constant - mAvqt len=0 
' 0018     20 LABEL : Cell Value, String Constant - mHoJa len=0 
' 0018     23 LABEL : Cell Value, String Constant - paiVmMrY len=0 
' 0018     23 LABEL : Cell Value, String Constant - qakvUlTF len=0 
' 0018     20 LABEL : Cell Value, String Constant - qjVtn len=0 
' 0018     26 LABEL : Cell Value, String Constant - SraWIgFGQIU len=0 
' 0018     22 LABEL : Cell Value, String Constant - SWNYUZb len=0 
' 0018     27 LABEL : Cell Value, String Constant - THfsbyeAnyBf len=0 
' 0018     20 LABEL : Cell Value, String Constant - VvxcP len=0 
' 0018     21 LABEL : Cell Value, String Constant - wxqMDs len=0 
' 0018     25 LABEL : Cell Value, String Constant - XKlyIpOhuS 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 LAB
... (truncated)

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