Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6ed00fe763fe329a…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:01 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: c57784b9b18cfb813595ede0c831f371 SHA-1: c56a269692ee2b6280cfe3903ee8166a02fd4260 SHA-256: 6ed00fe763fe329a5e1ab58876007f643429e97e4fa4e6f4447db6532d143a2b
140 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 (XLM) macros. Heuristics indicate the presence of an Auto_Open macro and the use of dangerous formula APIs, specifically the RUN function. This suggests the macro is intended to execute a command or payload automatically when the workbook is opened. No specific URLs or further payloads were extracted, hence the family is unknown.

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: 1a6faed260131358a3a2f3b6845e5d25ea1ff5ce309f5973be99f3b98edbbb18
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  mHFCKHkjV
' 0018     21 LABEL : Cell Value, String Constant - atoCmo len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D177 
' 0018     20 LABEL : Cell Value, String Constant - aZFjv len=0 
' 0018     20 LABEL : Cell Value, String Constant - BBicG len=0 
' 0018     25 LABEL : Cell Value, String Constant - dKGMWMVmeW len=0 
' 0018     26 LABEL : Cell Value, String Constant - dvMFWsVIKoY len=0 
' 0018     21 LABEL : Cell Value, String Constant - eQoMdM len=0 
' 0018     21 LABEL : Cell Value, String Constant - gMKnbj len=0 
' 0018     20 LABEL : Cell Value, String Constant - iHxaT len=0 
' 0018     21 LABEL : Cell Value, String Constant - IXoDZf len=0 
' 0018     23 LABEL : Cell Value, String Constant - khLBiwqb len=0 
' 0018     22 LABEL : Cell Value, String Constant - koRvqmW len=0 
' 0018     22 LABEL : Cell Value, String Constant - mwspXtJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - owBfc len=0 
' 0018     24 LABEL : Cell Value, String Constant - pwmTKHrQU len=0 
' 0018     23 LABEL : Cell Value, String Constant - tiZDHinU len=0 
' 0018     24 LABEL : Cell Value, String Constant - Usbhwjpzg len=0 
' 0018     25 LABEL : Cell Value, String Constant - vJKAPbgcUW len=0 
' 0018     24 LABEL : Cell Value, String Constant - vplOucLGQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - XItbOYWN len=0 
' 0018     26 LABEL : Cell Value, String Constant - yxDplaTEayg 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 LABELSST : C
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.