Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ab1c752a23a5e1dc…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:35:43 Authoring application: Microsoft Excel First seen: 2021-10-12
MD5: df6e30f1cad4cdda5cf6c02893a5b25d SHA-1: 46e936ec6a4e3b9a885a0aadab0672b6ee1a846d SHA-256: ab1c752a23a5e1dc8efa617534410742c32b0040c72953c3978166bdec062547
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. Heuristics indicate the presence of an Auto_Open macro and the use of dangerous formula APIs, specifically the RUN function. This suggests the macro is designed to execute an external payload. No specific URLs or further payloads were extracted, hence the family is unknown.

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: ba098c3ccb338ecbcaa773592e411775162da3556a1bfccc36e83973e40e5cbe
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  jJTAokYoD
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A180 
' 0018     27 LABEL : Cell Value, String Constant - bxXWuPUoEPFy len=0 
' 0018     23 LABEL : Cell Value, String Constant - DtdyjMVK len=0 
' 0018     25 LABEL : Cell Value, String Constant - EqfRPpSBFs len=0 
' 0018     26 LABEL : Cell Value, String Constant - fpZfOGIAUgH len=0 
' 0018     20 LABEL : Cell Value, String Constant - ImuAL len=0 
' 0018     20 LABEL : Cell Value, String Constant - jnscr len=0 
' 0018     23 LABEL : Cell Value, String Constant - JwZZHNCY len=0 
' 0018     20 LABEL : Cell Value, String Constant - KoOrk len=0 
' 0018     26 LABEL : Cell Value, String Constant - mavJNUtXRBy len=0 
' 0018     27 LABEL : Cell Value, String Constant - mCSQWVRoCBTR len=0 
' 0018     25 LABEL : Cell Value, String Constant - pxArXCeeCW len=0 
' 0018     21 LABEL : Cell Value, String Constant - qyGyMx len=0 
' 0018     24 LABEL : Cell Value, String Constant - RobeDNQwy len=0 
' 0018     25 LABEL : Cell Value, String Constant - rYGoNAcUcn len=0 
' 0018     20 LABEL : Cell Value, String Constant - uaSYY len=0 
' 0018     25 LABEL : Cell Value, String Constant - uoJplGeEdg len=0 
' 0018     22 LABEL : Cell Value, String Constant - WjdSCTL len=0 
' 0018     24 LABEL : Cell Value, String Constant - XqlsZclhX len=0 
' 0018     27 LABEL : Cell Value, String Constant - yVihfzjKNcFe len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZZyyReSXMd 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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