Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6d44457cc83ec40d…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:45:35 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: bca1e74db97079664f4f4e4aa1a40376 SHA-1: da0991c4f0faf7b87c723a76d5664e63aa3b7218 SHA-256: 6d44457cc83ec40dfd275287566b4f6499c5be1d45dbd77e2773ea02c835cb55
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 indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute external code. While no specific URLs or hashes were extracted, the technique strongly implies a downloader or initial execution stage for a more complex attack.

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) 6736 bytes
SHA-256: 5a9647037f708893282deaa3064bfa7c7d1e79871709bfcb172c93817831a5b9
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 -  pLBAks
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A169 
' 0018     24 LABEL : Cell Value, String Constant - BDtnKNvGm len=0 
' 0018     24 LABEL : Cell Value, String Constant - bmgLRxQwA len=0 
' 0018     26 LABEL : Cell Value, String Constant - dqakXQFnxqr len=0 
' 0018     27 LABEL : Cell Value, String Constant - FMfvBwtjTctr len=0 
' 0018     25 LABEL : Cell Value, String Constant - gaQddMywfi len=0 
' 0018     23 LABEL : Cell Value, String Constant - gSDNIQbi len=0 
' 0018     27 LABEL : Cell Value, String Constant - ibMiOxoZzYKc len=0 
' 0018     25 LABEL : Cell Value, String Constant - IgfIKZVIXA len=0 
' 0018     25 LABEL : Cell Value, String Constant - ilzCQjyqOK len=0 
' 0018     25 LABEL : Cell Value, String Constant - jaQqtBYvUp len=0 
' 0018     23 LABEL : Cell Value, String Constant - jnXHkUqO len=0 
' 0018     20 LABEL : Cell Value, String Constant - jwOkz len=0 
' 0018     21 LABEL : Cell Value, String Constant - OlalXP len=0 
' 0018     23 LABEL : Cell Value, String Constant - oqEUgXSe len=0 
' 0018     26 LABEL : Cell Value, String Constant - OVzhzgFpbhf len=0 
' 0018     20 LABEL : Cell Value, String Constant - QTwFt len=0 
' 0018     20 LABEL : Cell Value, String Constant - SmGBi len=0 
' 0018     21 LABEL : Cell Value, String Constant - usnIKN len=0 
' 0018     23 LABEL : Cell Value, String Constant - YBBinzIq len=0 
' 0018     25 LABEL : Cell Value, String Constant - yFvHKdECuG 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
' 00fd 
... (truncated)

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