Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 61e5853906ebb228…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:47:04 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 26e5dd75bb72b8af34be1fc755c0adba SHA-1: 7c0766b3bfb50f6f29b2a73b80a4ced25daeee03 SHA-256: 61e5853906ebb22886f26fc3aa69580949ddbd62e38bd9c470b7f6fda9b5a1cb
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 malicious execution. The presence of dangerous formula APIs like RUN further suggests that the macro is designed to execute arbitrary code. While no specific URLs or hashes were extracted, the Auto_Open macro is highly indicative of a downloader or initial execution stage for a more complex attack.

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) 6504 bytes
SHA-256: cf138af3a57d7e6db67c9d75f59c72ca713a9f3c16ebc55f531b8350e81ba10b
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  RDXp
' 0018     21 LABEL : Cell Value, String Constant - ApnLXf len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H142 
' 0018     24 LABEL : Cell Value, String Constant - BBDmdVKFt len=0 
' 0018     23 LABEL : Cell Value, String Constant - cAdPdvBc len=0 
' 0018     26 LABEL : Cell Value, String Constant - CgtkqLITZyV len=0 
' 0018     20 LABEL : Cell Value, String Constant - dlYyt len=0 
' 0018     21 LABEL : Cell Value, String Constant - eEIwhN len=0 
' 0018     22 LABEL : Cell Value, String Constant - fhXAUHJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - HBXsMlqYoa len=0 
' 0018     24 LABEL : Cell Value, String Constant - HlNyjYtRW len=0 
' 0018     23 LABEL : Cell Value, String Constant - iYzaDlqk len=0 
' 0018     26 LABEL : Cell Value, String Constant - jEnyBSDUcAe len=0 
' 0018     25 LABEL : Cell Value, String Constant - LWEslgNoBN len=0 
' 0018     27 LABEL : Cell Value, String Constant - pWmlntHZNOXg len=0 
' 0018     22 LABEL : Cell Value, String Constant - RCnwbMm len=0 
' 0018     20 LABEL : Cell Value, String Constant - ROlGY len=0 
' 0018     25 LABEL : Cell Value, String Constant - rPuwvJaDNU len=0 
' 0018     26 LABEL : Cell Value, String Constant - TcKLwHebRpq len=0 
' 0018     22 LABEL : Cell Value, String Constant - tpAOqPN len=0 
' 0018     24 LABEL : Cell Value, String Constant - ugJhBiegz len=0 
' 0018     22 LABEL : Cell Value, String Constant - XRbmDTN 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 
... (truncated)

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