Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1294343841b6b606…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:42:20 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: a99191f2c356f2f92cf4517d2400da62 SHA-1: a38ceb181829bd0fd7f0a216b3eba0f47f98f375 SHA-256: 1294343841b6b60609f7f3c674356af89dcdf00eaa784b5666ece0f54d75d3f7
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 macro, which is a known technique for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands. While the exact payload is not visible, the configuration strongly suggests it's designed to download and execute a secondary stage.

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) 6587 bytes
SHA-256: 6e5bd14f1086568b2082797b777b1f398705111ab6953d740abe7343f816d806
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  WSorpr
' 0018     27 LABEL : Cell Value, String Constant - ApWyXMgxpEja len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B172 
' 0018     23 LABEL : Cell Value, String Constant - BHYqtdwk len=0 
' 0018     22 LABEL : Cell Value, String Constant - diTWzhy len=0 
' 0018     21 LABEL : Cell Value, String Constant - eijMIS len=0 
' 0018     22 LABEL : Cell Value, String Constant - izpXYnQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - KDmePJmoxnu len=0 
' 0018     25 LABEL : Cell Value, String Constant - lHdEiLAVcr len=0 
' 0018     24 LABEL : Cell Value, String Constant - nCgNkFnzj len=0 
' 0018     26 LABEL : Cell Value, String Constant - rdYRotWeCbm len=0 
' 0018     24 LABEL : Cell Value, String Constant - RjKfkLpMQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - ToeNzjAXUADJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - uhyodtWtz len=0 
' 0018     25 LABEL : Cell Value, String Constant - viaRCKvZjz len=0 
' 0018     24 LABEL : Cell Value, String Constant - wjYOKJRHX len=0 
' 0018     24 LABEL : Cell Value, String Constant - wMznoBwwo len=0 
' 0018     22 LABEL : Cell Value, String Constant - wSTiOhm len=0 
' 0018     22 LABEL : Cell Value, String Constant - yJtjaFm len=0 
' 0018     21 LABEL : Cell Value, String Constant - YKijeC len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZcxlaAGMnCWj len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZrZRakWbUeD 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/ SS
... (truncated)

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