Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 54aa0e86fb3d6948…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:56 Authoring application: Microsoft Excel First seen: 2021-05-26
MD5: 90528726b40d587b67e39a5c8e48e8cc SHA-1: 8873e5165d08775005c775c1a0a819aa128d66cf SHA-256: 54aa0e86fb3d694875c2f28a9a8ab01a494034b896fc6bbaf53c299cf21a8183
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, which is a known method for executing malicious code upon opening the workbook. The macro sheet contains a reference to a dangerous formula API, specifically 'RUN', suggesting it is designed to execute external commands or payloads. No specific URLs or further payloads were extracted, but the technique strongly implies a downloader or initial execution stage.

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) 6492 bytes
SHA-256: fc9d9ce1f6290df841e2a27904216d99751506d37e874f4fbb48671f2d116dc5
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 -  gDQ
' 0018     21 LABEL : Cell Value, String Constant - Aizjay len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G170 
' 0018     27 LABEL : Cell Value, String Constant - cgANjgHRSpdB len=0 
' 0018     26 LABEL : Cell Value, String Constant - dokNhifCoTy len=0 
' 0018     22 LABEL : Cell Value, String Constant - EffKIVG len=0 
' 0018     21 LABEL : Cell Value, String Constant - Esdlrx len=0 
' 0018     27 LABEL : Cell Value, String Constant - eXKKUWEyaAiS len=0 
' 0018     27 LABEL : Cell Value, String Constant - ffbIQOHrJUHe len=0 
' 0018     25 LABEL : Cell Value, String Constant - GAXJjkPtoc len=0 
' 0018     25 LABEL : Cell Value, String Constant - GZmtRnplIT len=0 
' 0018     25 LABEL : Cell Value, String Constant - HJLyvjFJzj len=0 
' 0018     25 LABEL : Cell Value, String Constant - iceIVvPQTt len=0 
' 0018     25 LABEL : Cell Value, String Constant - JFdNKZwSYa len=0 
' 0018     27 LABEL : Cell Value, String Constant - JPkwYiiBxddH len=0 
' 0018     22 LABEL : Cell Value, String Constant - KVcmvYG len=0 
' 0018     25 LABEL : Cell Value, String Constant - LlCoKRxWnW len=0 
' 0018     25 LABEL : Cell Value, String Constant - mSelpargFx len=0 
' 0018     23 LABEL : Cell Value, String Constant - pmiatuzx len=0 
' 0018     22 LABEL : Cell Value, String Constant - qpSqNsF len=0 
' 0018     22 LABEL : Cell Value, String Constant - wBCUsLO len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZevMSUDYR 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/ S
... (truncated)

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