Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 62e472fabfc598bd…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:11 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 3c51637531a8ff44b56bef2f13d7d485 SHA-1: 74d7afac15cfd1b896133532ecc71b7111957b65 SHA-256: 62e472fabfc598bdac2c34ac61a3e31513ef1c0c626950367617af1d1014bd9d
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. The presence of dangerous formula APIs within the Auto_Open macro indicates an attempt to execute arbitrary code. While the exact payload is not discernible from the provided evidence, the mechanism strongly suggests the execution of a secondary malicious component.

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) 6487 bytes
SHA-256: 2836b16d6c61a504d399c9c1c2011005aee7554258eef221ade162b538b048a6
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 -  GlsrOm
' 0018     24 LABEL : Cell Value, String Constant - ASHKdAcUN len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D141 
' 0018     24 LABEL : Cell Value, String Constant - cOfsJWIJU len=0 
' 0018     23 LABEL : Cell Value, String Constant - DYvtVZJM len=0 
' 0018     27 LABEL : Cell Value, String Constant - eFhnPDGgQKss len=0 
' 0018     26 LABEL : Cell Value, String Constant - fWsQeVVMcVa len=0 
' 0018     20 LABEL : Cell Value, String Constant - GgNQI len=0 
' 0018     22 LABEL : Cell Value, String Constant - GqYXnra len=0 
' 0018     25 LABEL : Cell Value, String Constant - JcTRNBnZCm len=0 
' 0018     23 LABEL : Cell Value, String Constant - LaUExSej len=0 
' 0018     25 LABEL : Cell Value, String Constant - OgCPeWoEVN len=0 
' 0018     27 LABEL : Cell Value, String Constant - QDLASyfnWiLL len=0 
' 0018     27 LABEL : Cell Value, String Constant - rZgDckMwzYLx len=0 
' 0018     21 LABEL : Cell Value, String Constant - sNjGDq len=0 
' 0018     23 LABEL : Cell Value, String Constant - SSUWiGWy len=0 
' 0018     26 LABEL : Cell Value, String Constant - TEzXKaxChQb len=0 
' 0018     20 LABEL : Cell Value, String Constant - TIGjx len=0 
' 0018     21 LABEL : Cell Value, String Constant - viKSRH len=0 
' 0018     24 LABEL : Cell Value, String Constant - XyprjczmT len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZfENrYBEKm len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZgPQkEppx 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
' 0
... (truncated)

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