Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e1c046476d311748…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:00 Authoring application: Microsoft Excel First seen: 2021-10-01
MD5: a71a94849382552bfc5f1b6172a007d1 SHA-1: 4118640d86987de1e226200730df246924de0743 SHA-256: e1c046476d31174801fdeac01df69f556f9180ccef47adc4954aa1dd405fd1b4
140 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 macros, specifically an Auto_Open function, which is a known method for executing malicious code. The presence of dangerous formula APIs like RUN in the Auto_Open macro indicates an intent to execute arbitrary commands. The document body contains obfuscated text, suggesting an attempt to hide the malicious payload.

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) 6590 bytes
SHA-256: 443e80e804fb3426964107e11c65c06e2e02cd66908e21926798b2e5ae22a631
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  VaXnGCKkV
' 0018     24 LABEL : Cell Value, String Constant - ADqPdNPpk len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F189 
' 0018     21 LABEL : Cell Value, String Constant - bPuNXs len=0 
' 0018     25 LABEL : Cell Value, String Constant - buFkUqdLzc len=0 
' 0018     24 LABEL : Cell Value, String Constant - EeHTgWzyA len=0 
' 0018     25 LABEL : Cell Value, String Constant - eiqVRkITIy len=0 
' 0018     27 LABEL : Cell Value, String Constant - FDvNkzasoVyX len=0 
' 0018     23 LABEL : Cell Value, String Constant - ggirZGKw len=0 
' 0018     21 LABEL : Cell Value, String Constant - gTFHQE len=0 
' 0018     21 LABEL : Cell Value, String Constant - IclFet len=0 
' 0018     25 LABEL : Cell Value, String Constant - ivkngQuScj len=0 
' 0018     24 LABEL : Cell Value, String Constant - iwjeEJrie len=0 
' 0018     27 LABEL : Cell Value, String Constant - jTOVYxtjKseO len=0 
' 0018     20 LABEL : Cell Value, String Constant - KsMKS len=0 
' 0018     26 LABEL : Cell Value, String Constant - LXNBQSfElJc len=0 
' 0018     20 LABEL : Cell Value, String Constant - NoDCM len=0 
' 0018     27 LABEL : Cell Value, String Constant - raLYUKhvmjbo len=0 
' 0018     22 LABEL : Cell Value, String Constant - RTUjgDb len=0 
' 0018     22 LABEL : Cell Value, String Constant - rtvUHNg len=0 
' 0018     25 LABEL : Cell Value, String Constant - UoUmLBwKkl len=0 
' 0018     24 LABEL : Cell Value, String Constant - WDIYZWSiB 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
' 00
... (truncated)

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