Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 23779e16dacb2a39…

MALICIOUS

Office (OLE)

37.0 KB Created: 2020-11-27 11:46:02 Authoring application: Microsoft Excel First seen: 2021-07-02
MD5: 87d0810ffe9aa553ccf55ad616632c51 SHA-1: b5ba9bd52bc2eac08f065ec2072bd98f4313cdc6 SHA-256: 23779e16dacb2a397280f0be39d06f32a0a21847a9982446919568e9ac050762
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 function, which is a known method for executing malicious code. The presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands. Without further analysis of the macro's specific actions, the exact payload and delivery mechanism remain 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) 6681 bytes
SHA-256: b1038ca687be68e4306cdb1d3af656a443d2088ddc6829c9684cd86df57fb075
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 -  EtB
' 0018     22 LABEL : Cell Value, String Constant - akNlyWC len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C165 
' 0018     24 LABEL : Cell Value, String Constant - BkMsYMqmm len=0 
' 0018     25 LABEL : Cell Value, String Constant - dgyHQeocHP len=0 
' 0018     27 LABEL : Cell Value, String Constant - ecTAuUqbsyHS len=0 
' 0018     23 LABEL : Cell Value, String Constant - eKvZAShN len=0 
' 0018     21 LABEL : Cell Value, String Constant - fhKFzJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - gxImoT len=0 
' 0018     22 LABEL : Cell Value, String Constant - hLubnOm len=0 
' 0018     26 LABEL : Cell Value, String Constant - InzcgjXcpXh len=0 
' 0018     27 LABEL : Cell Value, String Constant - jfYmqluYnfVz len=0 
' 0018     24 LABEL : Cell Value, String Constant - kvazmAbXz len=0 
' 0018     20 LABEL : Cell Value, String Constant - ouvjJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - qIyYrEgiT len=0 
' 0018     20 LABEL : Cell Value, String Constant - qpSOq len=0 
' 0018     26 LABEL : Cell Value, String Constant - rAeTugsBHUO len=0 
' 0018     27 LABEL : Cell Value, String Constant - rEdzicZGxqlx len=0 
' 0018     27 LABEL : Cell Value, String Constant - ScvcNHGrZJFC len=0 
' 0018     20 LABEL : Cell Value, String Constant - tAPNo len=0 
' 0018     25 LABEL : Cell Value, String Constant - XydcgDIPTV len=0 
' 0018     24 LABEL : Cell Value, String Constant - xZfybSdHu 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)

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