Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5a1fb861c7bd678e…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:46:42 Authoring application: Microsoft Excel First seen: 2021-05-22
MD5: 98fed183f0c1bf1067e1307de0252a7b SHA-1: 4779165ac52d61ec889a4b6a87c03c84470df4c8 SHA-256: 5a1fb861c7bd678ed9fc58f8e02ba33acb4a66a5e957f7b149e1adf5e397d440
140 Risk Score

Malware Insights

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

This Excel file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name. This indicates that the file is designed to automatically execute malicious code upon opening. The presence of dangerous formula APIs further confirms the intent to run arbitrary commands, likely to download and execute a secondary 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) 6756 bytes
SHA-256: 12112e35946d25c610bffd465aa622831ddad39ff02a5ad46f3ae7bf90e616a7
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  nckzqAeI
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F180 
' 0018     20 LABEL : Cell Value, String Constant - bPdsa len=0 
' 0018     24 LABEL : Cell Value, String Constant - BywVHfShY len=0 
' 0018     20 LABEL : Cell Value, String Constant - CJGGF len=0 
' 0018     25 LABEL : Cell Value, String Constant - cNZGhmGtCn len=0 
' 0018     27 LABEL : Cell Value, String Constant - EswnQQSMHfPR len=0 
' 0018     23 LABEL : Cell Value, String Constant - FASChKqz len=0 
' 0018     25 LABEL : Cell Value, String Constant - hjCTYRyycs len=0 
' 0018     20 LABEL : Cell Value, String Constant - jIyUD len=0 
' 0018     24 LABEL : Cell Value, String Constant - kwWTiIeQr len=0 
' 0018     26 LABEL : Cell Value, String Constant - lrXVmITrtZB len=0 
' 0018     22 LABEL : Cell Value, String Constant - mAbEHSB len=0 
' 0018     25 LABEL : Cell Value, String Constant - PhDNwkVpPl len=0 
' 0018     20 LABEL : Cell Value, String Constant - RuCVr len=0 
' 0018     25 LABEL : Cell Value, String Constant - sDEjjcLWoG len=0 
' 0018     25 LABEL : Cell Value, String Constant - sZzbFyoDbp len=0 
' 0018     21 LABEL : Cell Value, String Constant - uTDLSu len=0 
' 0018     27 LABEL : Cell Value, String Constant - vjvQHRYmheyJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - YMGGTHesKo len=0 
' 0018     25 LABEL : Cell Value, String Constant - yTHugyCvHL len=0 
' 0018     25 LABEL : Cell Value, String Constant - yVQqQFOTsP 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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