Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4f7495003072e1ec…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:35 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: 0fbf746b95957ea3394698265f463d85 SHA-1: f34897a82774e5b35956bbf9e7c6b9d41d14d429 SHA-256: 4f7495003072e1ecb750d9a89f77c45189bd02e680578c228ed579c700e338a3
140 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro-enabled workbook. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code automatically when the workbook is opened. The macro sheet contains a call to a dangerous function (RUN), suggesting it is designed to execute arbitrary code.

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) 6653 bytes
SHA-256: 54ed660e54563833ba2d973ab78a67c89d673b28ec4c3cbb119ddf964d95e749
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  jmfalmOJNL
' 0018     23 LABEL : Cell Value, String Constant - ajLNBRTZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H138 
' 0018     23 LABEL : Cell Value, String Constant - AuWKLkJb len=0 
' 0018     27 LABEL : Cell Value, String Constant - BxvNYROvBwkU len=0 
' 0018     25 LABEL : Cell Value, String Constant - dFbQSuapbC len=0 
' 0018     23 LABEL : Cell Value, String Constant - dkMOhDDi len=0 
' 0018     25 LABEL : Cell Value, String Constant - esxduECGZh len=0 
' 0018     23 LABEL : Cell Value, String Constant - FgrxGOrE len=0 
' 0018     26 LABEL : Cell Value, String Constant - kALWNMVsdgW len=0 
' 0018     27 LABEL : Cell Value, String Constant - keOaZAIBegpc len=0 
' 0018     27 LABEL : Cell Value, String Constant - kpGErNZYaNkz len=0 
' 0018     26 LABEL : Cell Value, String Constant - lPaOHRjSbTY len=0 
' 0018     23 LABEL : Cell Value, String Constant - LsyawBDX len=0 
' 0018     21 LABEL : Cell Value, String Constant - QmeeMs len=0 
' 0018     23 LABEL : Cell Value, String Constant - rfHuvkcb len=0 
' 0018     22 LABEL : Cell Value, String Constant - RSvuQQm len=0 
' 0018     26 LABEL : Cell Value, String Constant - sZlVYagZmyS len=0 
' 0018     25 LABEL : Cell Value, String Constant - tKYoJKBURM len=0 
' 0018     26 LABEL : Cell Value, String Constant - uoVTRTqoKGU len=0 
' 0018     21 LABEL : Cell Value, String Constant - vgBiDD len=0 
' 0018     25 LABEL : Cell Value, String Constant - WIHFwuZyMP 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 Con
... (truncated)

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