Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 02f44a63f383c4da…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:33:52 Authoring application: Microsoft Excel First seen: 2021-06-17
MD5: 1431117a5e31937e1bca06e04e98ed05 SHA-1: 5821b8228e0fe4029519693a8471410473d84d43 SHA-256: 02f44a63f383c4da56e460c3d20fba18eeb48d1868c4ad284aa0dd4a8355ee5f
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 macro, which is a critical finding. The macros are designed to execute dangerous formula APIs, including the RUN function, indicating an intent to run arbitrary code. This strongly suggests the file is a downloader or dropper for a second-stage payload.

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) 6620 bytes
SHA-256: 17a1b8a86e7f56320249b7e913dee780328dc2961bfa2539314a47b585add3b5
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 -  mLomwOZSM
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H152 
' 0018     27 LABEL : Cell Value, String Constant - aVoArGLATwzJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - eNeBZYsEgTW len=0 
' 0018     26 LABEL : Cell Value, String Constant - IGXKjVlImmA len=0 
' 0018     21 LABEL : Cell Value, String Constant - kecgbN len=0 
' 0018     22 LABEL : Cell Value, String Constant - kfmzUZM len=0 
' 0018     26 LABEL : Cell Value, String Constant - LOcNCFBkaPY len=0 
' 0018     26 LABEL : Cell Value, String Constant - NfTfnqywnJA len=0 
' 0018     25 LABEL : Cell Value, String Constant - NpWViBLJXj len=0 
' 0018     25 LABEL : Cell Value, String Constant - PcQFlePmiZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - PJhlXPQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - pjVbBLmqCr len=0 
' 0018     22 LABEL : Cell Value, String Constant - RprRGmA len=0 
' 0018     25 LABEL : Cell Value, String Constant - rQEoPEjLUE len=0 
' 0018     25 LABEL : Cell Value, String Constant - SWPmtdiKvt len=0 
' 0018     20 LABEL : Cell Value, String Constant - tXQjy len=0 
' 0018     23 LABEL : Cell Value, String Constant - VsgtXZyl len=0 
' 0018     26 LABEL : Cell Value, String Constant - wpZJPEXDCWj len=0 
' 0018     27 LABEL : Cell Value, String Constant - XsNfMTjhddFx len=0 
' 0018     21 LABEL : Cell Value, String Constant - YLMfsD len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZdYvXD 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/ 
... (truncated)

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