Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 32093f277b0722a4…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:19 Authoring application: Microsoft Excel First seen: 2021-10-05
MD5: c425193788cdba9f13d90f5bcb62936b SHA-1: 40e6754a4211a34c94a3c3b2638aba9c6c611ac0 SHA-256: 32093f277b0722a44c96d80c33332a7a8bc2b02f5fed0e1547e62914f7e64e77
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 automatic execution upon opening. The macros utilize dangerous formula APIs, including a RUN function, suggesting the intent to execute arbitrary code. This is characteristic of a downloader or initial execution stage for further malicious activity.

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) 6668 bytes
SHA-256: 98f99eb3bfb0b760a1a4066198c03f902679ce06b8f1c91834b80f25d2fc89f1
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  aBcWxL
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H154 
' 0018     20 LABEL : Cell Value, String Constant - bjhQo len=0 
' 0018     25 LABEL : Cell Value, String Constant - BzLezClEIH len=0 
' 0018     22 LABEL : Cell Value, String Constant - EhZiClK len=0 
' 0018     20 LABEL : Cell Value, String Constant - HLnIc len=0 
' 0018     23 LABEL : Cell Value, String Constant - HVfcgUkd len=0 
' 0018     27 LABEL : Cell Value, String Constant - icoPyqbMQXcK len=0 
' 0018     23 LABEL : Cell Value, String Constant - IUgdQXKi len=0 
' 0018     26 LABEL : Cell Value, String Constant - jVuXtfEhjnu len=0 
' 0018     23 LABEL : Cell Value, String Constant - KzxmqQDE len=0 
' 0018     25 LABEL : Cell Value, String Constant - lKJjLzOemx len=0 
' 0018     27 LABEL : Cell Value, String Constant - mDNBnJYFTOgH len=0 
' 0018     23 LABEL : Cell Value, String Constant - NvkDhsjS len=0 
' 0018     20 LABEL : Cell Value, String Constant - PspOn len=0 
' 0018     25 LABEL : Cell Value, String Constant - QFtIULDApf len=0 
' 0018     23 LABEL : Cell Value, String Constant - rdEIRytQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - TkxfEnlUx len=0 
' 0018     20 LABEL : Cell Value, String Constant - UVNna len=0 
' 0018     20 LABEL : Cell Value, String Constant - vgFFG len=0 
' 0018     27 LABEL : Cell Value, String Constant - vPNHOSutqWHv len=0 
' 0018     25 LABEL : Cell Value, String Constant - YTKvvQtZuR 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     1
... (truncated)

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