Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6c7ab15bbf69f0ec…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:45:57 Authoring application: Microsoft Excel First seen: 2021-09-29
MD5: 191839515fc2700467e8804854ac0563 SHA-1: 0aac7252bb9aff3d020a1b2ea3c38eea03d5599e SHA-256: 6c7ab15bbf69f0ec24d47e561c8636b1615ae7b63597986389a23382b5a90ef5
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 presence of dangerous formula APIs like RUN suggests the macro is designed to execute external code. While the exact payload is not visible, the technique strongly implies 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) 6563 bytes
SHA-256: 5da643fed862297620b47f7703279ff57ccc7dab8e567764e005f485127ec60e
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  LlbYFdYZ
' 0018     20 LABEL : Cell Value, String Constant - aHrtP len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I140 
' 0018     26 LABEL : Cell Value, String Constant - BdJOaRdxGQm len=0 
' 0018     26 LABEL : Cell Value, String Constant - bqYLYCZglYz len=0 
' 0018     24 LABEL : Cell Value, String Constant - CFfXHEAOn len=0 
' 0018     21 LABEL : Cell Value, String Constant - diZNNw len=0 
' 0018     20 LABEL : Cell Value, String Constant - gCTJR len=0 
' 0018     21 LABEL : Cell Value, String Constant - hazavZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - iinVdl len=0 
' 0018     21 LABEL : Cell Value, String Constant - jCCPxD len=0 
' 0018     25 LABEL : Cell Value, String Constant - JLiukftohU len=0 
' 0018     24 LABEL : Cell Value, String Constant - oaoUTnQlY len=0 
' 0018     23 LABEL : Cell Value, String Constant - pANJBcZI len=0 
' 0018     27 LABEL : Cell Value, String Constant - pwJkYSrmFipR len=0 
' 0018     27 LABEL : Cell Value, String Constant - QCfMOCqqKUlL len=0 
' 0018     26 LABEL : Cell Value, String Constant - qkRQnEoNDiJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - UjKIpKgZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - ujLypLJpgMCr len=0 
' 0018     27 LABEL : Cell Value, String Constant - UoXaNHNiMPID len=0 
' 0018     26 LABEL : Cell Value, String Constant - uXrfPWOVzqk len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZhDcYe 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
' 
... (truncated)

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