Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 46a9bf1b928cea3a…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:32 Authoring application: Microsoft Excel First seen: 2021-09-29
MD5: 1740ec124175858656b8ceb846d49d90 SHA-1: 0b44bdbaacec8209275d2046593b0079851e8b37 SHA-256: 46a9bf1b928cea3a9125fe109868b4224fb5b1a8de61a75a48fed2d7b48a4227
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open defined name, which is a critical indicator of malicious intent. This technique allows for the execution of arbitrary commands upon opening the workbook, commonly used to download and execute further malicious payloads. The presence of dangerous formula APIs further supports this assessment.

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) 6532 bytes
SHA-256: 49bc8cae349161d4b0ccb942bd109c49f6c1e7466453579e564c4614fe0d4a72
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 -  lRdknG
' 0018     23 LABEL : Cell Value, String Constant - AFozXPBS len=0 
' 0018     27 LABEL : Cell Value, String Constant - AJnSFjPzsVBT len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E147 
' 0018     23 LABEL : Cell Value, String Constant - CKWyibGD len=0 
' 0018     27 LABEL : Cell Value, String Constant - dqpvBeJvmJPG len=0 
' 0018     24 LABEL : Cell Value, String Constant - EArNgbSQi len=0 
' 0018     26 LABEL : Cell Value, String Constant - eXAmVQSzkrp len=0 
' 0018     25 LABEL : Cell Value, String Constant - hvCkyXpadq len=0 
' 0018     21 LABEL : Cell Value, String Constant - ibiUgZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - INSTkpb len=0 
' 0018     25 LABEL : Cell Value, String Constant - jVbzGDMzsG len=0 
' 0018     22 LABEL : Cell Value, String Constant - jWWvYqc len=0 
' 0018     21 LABEL : Cell Value, String Constant - MUCwPc len=0 
' 0018     26 LABEL : Cell Value, String Constant - mXnEzQnWAGs len=0 
' 0018     21 LABEL : Cell Value, String Constant - odjNHY len=0 
' 0018     23 LABEL : Cell Value, String Constant - phyxypbc len=0 
' 0018     25 LABEL : Cell Value, String Constant - SmYWTTxkeN len=0 
' 0018     21 LABEL : Cell Value, String Constant - uiDUdp len=0 
' 0018     23 LABEL : Cell Value, String Constant - VVFBdpKf len=0 
' 0018     24 LABEL : Cell Value, String Constant - WFIBpVPyz len=0 
' 0018     25 LABEL : Cell Value, String Constant - wGXHIIQswH 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)

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