Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3392e718bd24e1ec…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:44:56 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: def8b1c249a03b9a5a03f34559a0a0d7 SHA-1: 591383ed95b3d1ba875df2627a30eb8f9f47178d SHA-256: 3392e718bd24e1ecab59604658b1d8f4aaef241ab5b46f52d1529d990783fe9d
140 Risk Score

Malware Insights

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

This Excel file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a known method for executing malicious code upon opening the workbook. The presence of dangerous formula APIs in the Auto_Open macro indicates an intent to perform harmful actions. Without further deobfuscation or dynamic analysis, the exact payload and its target are unknown, leading to an 'unknown family' classification.

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) 6717 bytes
SHA-256: 7be7d97a7c4fddfc14a7790386fa10923c5751b2528302586a0a740b204ad436
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 -  YDLyLU
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A156 
' 0018     27 LABEL : Cell Value, String Constant - BkMySuHwmetZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - DRyQdq len=0 
' 0018     24 LABEL : Cell Value, String Constant - eikBLptvV len=0 
' 0018     25 LABEL : Cell Value, String Constant - hAPVsawTcp len=0 
' 0018     23 LABEL : Cell Value, String Constant - IISiGayA len=0 
' 0018     23 LABEL : Cell Value, String Constant - iSmwIwjg len=0 
' 0018     20 LABEL : Cell Value, String Constant - lgCtu len=0 
' 0018     21 LABEL : Cell Value, String Constant - LwGVtU len=0 
' 0018     22 LABEL : Cell Value, String Constant - nKqUSkP len=0 
' 0018     23 LABEL : Cell Value, String Constant - oAnDYila len=0 
' 0018     20 LABEL : Cell Value, String Constant - oaohs len=0 
' 0018     27 LABEL : Cell Value, String Constant - owPMsoansfFk len=0 
' 0018     23 LABEL : Cell Value, String Constant - QtLOkqRK len=0 
' 0018     26 LABEL : Cell Value, String Constant - rEouJNUhTEo len=0 
' 0018     25 LABEL : Cell Value, String Constant - UJTOdMxGOA len=0 
' 0018     27 LABEL : Cell Value, String Constant - XhBvhGAkMSlF len=0 
' 0018     22 LABEL : Cell Value, String Constant - xQOTSqP len=0 
' 0018     22 LABEL : Cell Value, String Constant - YtqsxWu len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZLkSDfR len=0 
' 0018     24 LABEL : Cell Value, String Constant - zvStaWeZJ 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     10
... (truncated)

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