Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8c70358c67910ea5…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:15 Authoring application: Microsoft Excel First seen: 2021-06-17
MD5: 6c34d9e64f01d66c82c8170d6ade4311 SHA-1: c57b67f0d2d96fd897f672e88ea47fa32b87ef5e SHA-256: 8c70358c67910ea5e43a728ca15288b1a9ccc0b3e03cbf8632caeb56f9c371e4
140 Risk Score

Malware Insights

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

The file is an Excel document containing Excel 4.0 (XLM) macros. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code automatically when the workbook is opened. This macro likely serves to download and execute a second-stage payload, although the specific payload and its destination are not detailed in the provided evidence.

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) 6556 bytes
SHA-256: 5d4648c7b947cc010fe3ac98c5af491ea8f8e2e8f83e73be00480a0fa0232b35
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Toz
' 0018     26 LABEL : Cell Value, String Constant - aSeBWodRUGY len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F158 
' 0018     23 LABEL : Cell Value, String Constant - CnRhIpgx len=0 
' 0018     22 LABEL : Cell Value, String Constant - CQCTqTj len=0 
' 0018     24 LABEL : Cell Value, String Constant - eaeHwWRfk len=0 
' 0018     20 LABEL : Cell Value, String Constant - FLpMn len=0 
' 0018     27 LABEL : Cell Value, String Constant - guFXvlgVcpJc len=0 
' 0018     23 LABEL : Cell Value, String Constant - JlMTDXwk len=0 
' 0018     24 LABEL : Cell Value, String Constant - KchSBCwrG len=0 
' 0018     23 LABEL : Cell Value, String Constant - KIRbEehg len=0 
' 0018     26 LABEL : Cell Value, String Constant - kJWMQzpaBmz len=0 
' 0018     25 LABEL : Cell Value, String Constant - lImXveIkAw len=0 
' 0018     20 LABEL : Cell Value, String Constant - mNrnD len=0 
' 0018     20 LABEL : Cell Value, String Constant - mRfsf len=0 
' 0018     20 LABEL : Cell Value, String Constant - OaSbt len=0 
' 0018     27 LABEL : Cell Value, String Constant - PdfHwAsCMvJY len=0 
' 0018     21 LABEL : Cell Value, String Constant - RGwtiC len=0 
' 0018     27 LABEL : Cell Value, String Constant - TtWowbuISYar len=0 
' 0018     27 LABEL : Cell Value, String Constant - uSSHXxVJPHwj len=0 
' 0018     22 LABEL : Cell Value, String Constant - YOEcgyv len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZWelRHFKcnab 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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