Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 622ddb80193492b7…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:23 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 5b311a3c2e56a5c9484201d00790374e SHA-1: f4cc04ec53ceed3d26daa7529039472028d998d8 SHA-256: 622ddb80193492b70d9ab9d6fcad82ed670bf62376423d58c1fca4b780b264e8
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-enabled workbook containing an Auto_Open function. This function is designed to execute arbitrary code upon opening, which is a common technique for downloading and executing further malicious payloads. The critical heuristics indicate the presence of dangerous formula APIs within the Auto_Open macro, confirming its malicious intent.

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) 6513 bytes
SHA-256: c0b85f5559c61bcfc1a7931aa06b1b24f194f2137362a9af7d62a49a66bfcb51
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  TLLIFiF
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E160 
' 0018     27 LABEL : Cell Value, String Constant - BrrDgdQvXivz len=0 
' 0018     21 LABEL : Cell Value, String Constant - cZBJUo len=0 
' 0018     25 LABEL : Cell Value, String Constant - DvrJxyOVAR len=0 
' 0018     27 LABEL : Cell Value, String Constant - fhYxEALQCfBy len=0 
' 0018     20 LABEL : Cell Value, String Constant - gpdtj len=0 
' 0018     22 LABEL : Cell Value, String Constant - HRUveZz len=0 
' 0018     25 LABEL : Cell Value, String Constant - InfYHXxHiH len=0 
' 0018     20 LABEL : Cell Value, String Constant - IPcQU len=0 
' 0018     26 LABEL : Cell Value, String Constant - KNcprKhXNZs len=0 
' 0018     27 LABEL : Cell Value, String Constant - oeUxixmCLkix len=0 
' 0018     21 LABEL : Cell Value, String Constant - oKjEYk len=0 
' 0018     22 LABEL : Cell Value, String Constant - PmaufaO len=0 
' 0018     27 LABEL : Cell Value, String Constant - pZMFxdkCflEx len=0 
' 0018     21 LABEL : Cell Value, String Constant - qFjomb len=0 
' 0018     24 LABEL : Cell Value, String Constant - qXFTbcOKd len=0 
' 0018     22 LABEL : Cell Value, String Constant - rIrmFey len=0 
' 0018     20 LABEL : Cell Value, String Constant - rJYNI len=0 
' 0018     26 LABEL : Cell Value, String Constant - tCketbfBOJU len=0 
' 0018     21 LABEL : Cell Value, String Constant - yPFwnR len=0 
' 0018     24 LABEL : Cell Value, String Constant - zxMwUwqzc 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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