Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 506554244abc66a6…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:25 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: 9051769d08e0f78c8a93b1a00c46e29b SHA-1: 1fdd5ccb5de03f54f4c306866ce25556a95a584c SHA-256: 506554244abc66a674e0216cd791694265cc1b4ebd6ff2416a9037d37aaf419b
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 defined name, which is a critical finding indicating automatic execution. The presence of dangerous formula APIs like RUN further suggests malicious intent. While the exact payload is not discernible from the provided evidence, the Auto_Open macro is designed to execute arbitrary code, likely leading to further compromise.

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) 6498 bytes
SHA-256: 0c0eb5649b427625776b48325b2c9124c7716f1f0936899a89bc004b372f1267
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  AzhuIGc
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A138 
' 0018     26 LABEL : Cell Value, String Constant - DhMTCpvcxza len=0 
' 0018     24 LABEL : Cell Value, String Constant - imxiBrLYb len=0 
' 0018     23 LABEL : Cell Value, String Constant - kGThdgub len=0 
' 0018     26 LABEL : Cell Value, String Constant - KPMHIdiucYy len=0 
' 0018     21 LABEL : Cell Value, String Constant - mIHJXE len=0 
' 0018     21 LABEL : Cell Value, String Constant - NDllSE len=0 
' 0018     27 LABEL : Cell Value, String Constant - OPypGytKunmJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - pfMYbvaEqbO len=0 
' 0018     25 LABEL : Cell Value, String Constant - PhUGOvvSMk len=0 
' 0018     23 LABEL : Cell Value, String Constant - PYQjtloX len=0 
' 0018     21 LABEL : Cell Value, String Constant - RPNNMQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - SFBnc len=0 
' 0018     23 LABEL : Cell Value, String Constant - srxOgcKh len=0 
' 0018     24 LABEL : Cell Value, String Constant - TcYoMqqLm len=0 
' 0018     24 LABEL : Cell Value, String Constant - tDoLUeKim len=0 
' 0018     26 LABEL : Cell Value, String Constant - UkeCaJBYkyO len=0 
' 0018     23 LABEL : Cell Value, String Constant - vkBWgYmM len=0 
' 0018     21 LABEL : Cell Value, String Constant - XHNWJq len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZaGIEDI len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZWbmCJ 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     1
... (truncated)

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