Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0b1b962b48f627fa…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:46:01 Authoring application: Microsoft Excel First seen: 2021-07-07
MD5: 1ea7a78987b7c06d691bb5a838edf285 SHA-1: 04d42ef372970263edd96e11fa86b1e9c339081c SHA-256: 0b1b962b48f627faa22b831de32b6dc6b4ec2d71e1da51527d4c5ee808bc0ebd
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a critical finding. This indicates the macro will execute automatically when the workbook is opened. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely downloading and running a second-stage payload. No specific family could be identified.

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) 6622 bytes
SHA-256: c638dc18f051debbd3cd16216f985b6b8efefcb41435f0f7072703b33a4ac3d5
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  KBNQ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E184 
' 0018     25 LABEL : Cell Value, String Constant - blEEAJAadR len=0 
' 0018     26 LABEL : Cell Value, String Constant - CmLWrdXpUmY len=0 
' 0018     25 LABEL : Cell Value, String Constant - cOtCANCrKJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - jksWJTcRyg len=0 
' 0018     25 LABEL : Cell Value, String Constant - JOJsxArCda len=0 
' 0018     27 LABEL : Cell Value, String Constant - kNsUHaQiHpUd len=0 
' 0018     21 LABEL : Cell Value, String Constant - LvajfO len=0 
' 0018     26 LABEL : Cell Value, String Constant - NPTtXeIytHg len=0 
' 0018     27 LABEL : Cell Value, String Constant - QgxakCgxNfkb len=0 
' 0018     20 LABEL : Cell Value, String Constant - QIwvm len=0 
' 0018     23 LABEL : Cell Value, String Constant - QvQHDOku len=0 
' 0018     27 LABEL : Cell Value, String Constant - rdJAtLUqLbYZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - rhAzwztSnU len=0 
' 0018     26 LABEL : Cell Value, String Constant - rhGenSCKPZP len=0 
' 0018     24 LABEL : Cell Value, String Constant - VagaikwDy len=0 
' 0018     20 LABEL : Cell Value, String Constant - VeHTb len=0 
' 0018     20 LABEL : Cell Value, String Constant - xAwCN len=0 
' 0018     20 LABEL : Cell Value, String Constant - yvjxa len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZjErCq len=0 
' 0018     27 LABEL : Cell Value, String Constant - zkBEfriFjgyd 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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