Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 889851e1f04881d9…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:41:57 Authoring application: Microsoft Excel First seen: 2021-07-07
MD5: bdc77b46c2b8e0182e60de21b38d691d SHA-1: 474e652653687d1d9a49324bf43a2a09013721db SHA-256: 889851e1f04881d9a3ee29f793cb1a4520009ee949b8b0a323d584ed129335d1
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro sheet containing an Auto_Open function, which is a critical finding indicating automatic execution upon opening. The macro sheet also utilizes dangerous formula APIs, specifically the RUN function, to execute arbitrary commands. This suggests the file is designed to deliver a malicious payload or perform unauthorized actions immediately after being opened by a user.

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) 6680 bytes
SHA-256: ec82169c6162d7c863cf88bdc449df64439e2336320d1657c97a60b1e4acea4b
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  JZrcphWbwZn
' 0018     27 LABEL : Cell Value, String Constant - alSvRFdqZvbM len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D137 
' 0018     20 LABEL : Cell Value, String Constant - bqCRh len=0 
' 0018     27 LABEL : Cell Value, String Constant - BypHAoJDdQQn len=0 
' 0018     22 LABEL : Cell Value, String Constant - ehoEUQN len=0 
' 0018     25 LABEL : Cell Value, String Constant - gwztXSdoIq len=0 
' 0018     24 LABEL : Cell Value, String Constant - hvsFUCDFb len=0 
' 0018     21 LABEL : Cell Value, String Constant - ieKOyY len=0 
' 0018     20 LABEL : Cell Value, String Constant - JuWBO len=0 
' 0018     21 LABEL : Cell Value, String Constant - jZBhEo len=0 
' 0018     24 LABEL : Cell Value, String Constant - LUNpxREoS len=0 
' 0018     26 LABEL : Cell Value, String Constant - mqXAQOxVClr len=0 
' 0018     25 LABEL : Cell Value, String Constant - pkKFhbMIrd len=0 
' 0018     23 LABEL : Cell Value, String Constant - qfVqcRuT len=0 
' 0018     22 LABEL : Cell Value, String Constant - qVoMwtj len=0 
' 0018     24 LABEL : Cell Value, String Constant - rLtqfpYIQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - SEMvDNM len=0 
' 0018     24 LABEL : Cell Value, String Constant - uDXCMkbnT len=0 
' 0018     22 LABEL : Cell Value, String Constant - WQfupvK len=0 
' 0018     24 LABEL : Cell Value, String Constant - XqdsShNPj len=0 
' 0018     25 LABEL : Cell Value, String Constant - YQiDBFECGM 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 
... (truncated)

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