Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3bbb14c01ad3a001…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:37 Authoring application: Microsoft Excel First seen: 2021-09-17
MD5: fab57f21fcaaaecb789cce68808967da SHA-1: 6838f392291f918b9af564b3c7c0228e7820392f SHA-256: 3bbb14c01ad3a00102482ec18952f98423e45561537857069d622811c6449f75
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. This indicates the macro will execute automatically when the workbook is opened. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely to download and run a secondary payload. No specific family could be identified.

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) 6641 bytes
SHA-256: 1f40dc835223abf02bbc72ef85e92b24457de1f88ffa3eea5ef5e800cf40ac39
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  nOXSgjCSMh
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F188 
' 0018     25 LABEL : Cell Value, String Constant - dCUKuYpBSu len=0 
' 0018     23 LABEL : Cell Value, String Constant - EhQbZKYi len=0 
' 0018     24 LABEL : Cell Value, String Constant - EMYUGunne len=0 
' 0018     26 LABEL : Cell Value, String Constant - etYXTEBjQTe len=0 
' 0018     24 LABEL : Cell Value, String Constant - ICuMeMhAw len=0 
' 0018     27 LABEL : Cell Value, String Constant - IegLEoXTnJjz len=0 
' 0018     27 LABEL : Cell Value, String Constant - iflbeRxzDZic len=0 
' 0018     23 LABEL : Cell Value, String Constant - iIqpNMns len=0 
' 0018     24 LABEL : Cell Value, String Constant - ILAdinoKN len=0 
' 0018     26 LABEL : Cell Value, String Constant - KrCNFgAVWQi len=0 
' 0018     27 LABEL : Cell Value, String Constant - MvKnTOmgPfqd len=0 
' 0018     20 LABEL : Cell Value, String Constant - ndjSI len=0 
' 0018     27 LABEL : Cell Value, String Constant - rRsiKnsGVntY len=0 
' 0018     24 LABEL : Cell Value, String Constant - SioaMdPhE len=0 
' 0018     26 LABEL : Cell Value, String Constant - souRlzAOqVg len=0 
' 0018     20 LABEL : Cell Value, String Constant - SZuyw len=0 
' 0018     22 LABEL : Cell Value, String Constant - teNsoNO len=0 
' 0018     20 LABEL : Cell Value, String Constant - TffMc len=0 
' 0018     22 LABEL : Cell Value, String Constant - UjlAdAS len=0 
' 0018     21 LABEL : Cell Value, String Constant - YXxdin 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/ SS
... (truncated)

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