Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 93ca7fbe3e1d60ac…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:59 Authoring application: Microsoft Excel First seen: 2021-06-04
MD5: 71a3e60ddd24064a78ad69d429aa12fa SHA-1: 8848acf23c2f40f3fa5d387fdcdce2b2f84ad4e6 SHA-256: 93ca7fbe3e1d60acb7cefa11a2cfb2987f6ad04303c529eb41253f7557416b66
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 known technique for executing malicious code upon opening the workbook. The critical heuristic firings indicate the presence of dangerous formula APIs within the XLM macro, suggesting it is designed to run arbitrary commands.

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) 6577 bytes
SHA-256: 0e613e3cd696ba000706c1a0283f5541f84c00c7d0f15e02785a945d0d559f94
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  NHeRbuUSBX
' 0018     27 LABEL : Cell Value, String Constant - aPlhGWZXNJjH len=0 
' 0018     20 LABEL : Cell Value, String Constant - AusuU len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E151 
' 0018     25 LABEL : Cell Value, String Constant - cxlOnAumqG len=0 
' 0018     25 LABEL : Cell Value, String Constant - FINXsUuAst len=0 
' 0018     21 LABEL : Cell Value, String Constant - fIsIVW len=0 
' 0018     20 LABEL : Cell Value, String Constant - hkUqM len=0 
' 0018     26 LABEL : Cell Value, String Constant - LBzXShQYcVP len=0 
' 0018     26 LABEL : Cell Value, String Constant - pczTUlYQOPY len=0 
' 0018     21 LABEL : Cell Value, String Constant - PiIUrj len=0 
' 0018     22 LABEL : Cell Value, String Constant - plPfOsu len=0 
' 0018     27 LABEL : Cell Value, String Constant - RAeeSzKdYnmZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - raMIi len=0 
' 0018     21 LABEL : Cell Value, String Constant - rigIvb len=0 
' 0018     23 LABEL : Cell Value, String Constant - UpBYZNjD len=0 
' 0018     27 LABEL : Cell Value, String Constant - UqxQUfVyhTtp len=0 
' 0018     22 LABEL : Cell Value, String Constant - vRxcjMu len=0 
' 0018     22 LABEL : Cell Value, String Constant - WDANCVP len=0 
' 0018     20 LABEL : Cell Value, String Constant - XVzay len=0 
' 0018     20 LABEL : Cell Value, String Constant - yMhnt len=0 
' 0018     25 LABEL : Cell Value, String Constant - YQhfnZzYKF 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 LA
... (truncated)

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