Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 88903b5ec46bcaee…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:47:31 Authoring application: Microsoft Excel First seen: 2021-07-07
MD5: adda3bea1143927469ea87c6dafd9968 SHA-1: 2f2f7d3415bc3d976c58c57dbc32d06f9c933b36 SHA-256: 88903b5ec46bcaeea1087ac3f49373a06d52de24012bf84ad8c5890c0551f96a
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 indicator of malicious activity. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. While the exact payload is not discernible from the provided evidence, the Auto_Open function is a common technique for initial execution of malware.

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) 6798 bytes
SHA-256: 89584df7056e5ef47ca84fc2828449d89bcd6b48c5bae7bafea152102808053d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  anaVQdDWje
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H149 
' 0018     20 LABEL : Cell Value, String Constant - BLihu len=0 
' 0018     21 LABEL : Cell Value, String Constant - CnYKaU len=0 
' 0018     25 LABEL : Cell Value, String Constant - EsfYdytDXz len=0 
' 0018     20 LABEL : Cell Value, String Constant - gqaei len=0 
' 0018     23 LABEL : Cell Value, String Constant - izSyuENG len=0 
' 0018     27 LABEL : Cell Value, String Constant - LaHftzNKZVHG len=0 
' 0018     23 LABEL : Cell Value, String Constant - LvXrpcIQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - MJtKS len=0 
' 0018     23 LABEL : Cell Value, String Constant - nfcJUUVK len=0 
' 0018     26 LABEL : Cell Value, String Constant - oIniVTeLvWl len=0 
' 0018     25 LABEL : Cell Value, String Constant - OpiAFZzlpA len=0 
' 0018     20 LABEL : Cell Value, String Constant - PCjnv len=0 
' 0018     23 LABEL : Cell Value, String Constant - PtxCJINY len=0 
' 0018     27 LABEL : Cell Value, String Constant - PVGKlkuFSLoT len=0 
' 0018     27 LABEL : Cell Value, String Constant - TWigfBqDVzMo len=0 
' 0018     20 LABEL : Cell Value, String Constant - vjBGK len=0 
' 0018     20 LABEL : Cell Value, String Constant - VQfAx len=0 
' 0018     22 LABEL : Cell Value, String Constant - WFCfeHT len=0 
' 0018     24 LABEL : Cell Value, String Constant - ySZfcyLYJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - zOMDVqVp 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 LAB
... (truncated)

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