Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 62cc9bcb926dba01…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:48 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 6654660a7a4844499cee1d43c4f5afbc SHA-1: f8110f51bb20c77d69618c829fdcf43654a65592 SHA-256: 62cc9bcb926dba010a8f1862231594297e7b0b974c3df74a0496b261468d98ad
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 entry, which is a critical finding indicating automatic execution. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. While no specific URLs or hashes were extracted, the Auto_Open macro is the primary indicator of malicious intent, likely serving as a downloader or initial execution vector.

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) 6548 bytes
SHA-256: 341279f989517e1694c56bd8a02fb6901942b68fca0a3b5485692ad1b4e486d9
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  bwkpf
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A155 
' 0018     22 LABEL : Cell Value, String Constant - aWMMLVG len=0 
' 0018     20 LABEL : Cell Value, String Constant - BwhSP len=0 
' 0018     21 LABEL : Cell Value, String Constant - dCKXHU len=0 
' 0018     26 LABEL : Cell Value, String Constant - dmdQuFiZGKR len=0 
' 0018     22 LABEL : Cell Value, String Constant - drMUGTO len=0 
' 0018     21 LABEL : Cell Value, String Constant - flWdtE len=0 
' 0018     23 LABEL : Cell Value, String Constant - fmMgVNMB len=0 
' 0018     23 LABEL : Cell Value, String Constant - fQHPULwN len=0 
' 0018     20 LABEL : Cell Value, String Constant - hEyyS len=0 
' 0018     20 LABEL : Cell Value, String Constant - jnaFe len=0 
' 0018     24 LABEL : Cell Value, String Constant - KsUHASgTB len=0 
' 0018     27 LABEL : Cell Value, String Constant - lRAYGlzXyJGM len=0 
' 0018     21 LABEL : Cell Value, String Constant - mWRlvj len=0 
' 0018     20 LABEL : Cell Value, String Constant - mxCCi len=0 
' 0018     20 LABEL : Cell Value, String Constant - oIIKe len=0 
' 0018     21 LABEL : Cell Value, String Constant - QHUPJz len=0 
' 0018     20 LABEL : Cell Value, String Constant - QyVWS len=0 
' 0018     27 LABEL : Cell Value, String Constant - TWTgLlSPDBDR len=0 
' 0018     23 LABEL : Cell Value, String Constant - XstwWIln len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZURqxPEtp 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 Value,
... (truncated)

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