umbral | c73691a41f00ef9996d4dc6c045630d279e181bad3637b284f60479e62881c0c

Analysis

max time kernel
127s
max time network
133s
platform
windows10-1703_x64
resource
win10-20231215-en
resource tags

arch:x64arch:x86image:win10-20231215-enlocale:en-usos:windows10-1703-x64system
submitted
15-12-2023 21:30

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General

Target

Z1ON Dot Net Obfuscator.exe
Size

1.9MB
MD5

8ec9b900dbb217f1569c50c14d4adf34
SHA1

d73701be4fc77450549011cc6c19f37feddcf5b4
SHA256

c73691a41f00ef9996d4dc6c045630d279e181bad3637b284f60479e62881c0c
SHA512

4486419c5b338a17e813acbca2a5300ce085e172a588ae93bec3927fada2ad0f763dff34a944370fc350ea48c6ed9752a2da553309fe5cefffb81811eed39f6b
SSDEEP

49152:wZz/tPlg5nvjlIQH6gVTBicEE0ZPnQvEtQo3A:wZTtPaR7d5IRQvQl

Score

10^/10

umbral stealer

Malware Config

Extracted

Family

umbral

https://discord.com/api/webhooks/1181926505694105630/CE5sVzq-GthkGDnvcUQZk7Evr9osSekTkqbwPbUukyJDim0j7oTaR65R-5mv1Sfx-3Re

Signatures

Detect Umbral payload 3 IoCs

resource	yara_rule
behavioral1/files/0x000900000001ab1b-57.dat	family_umbral
behavioral1/memory/4740-60-0x000001CF41460000-0x000001CF414A0000-memory.dmp	family_umbral
behavioral1/files/0x000900000001ab1b-176.dat	family_umbral

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral

Executes dropped EXE 3 IoCs

pid	Process
4740	Runtime Broker.exe
4300	Runtime Broker.exe
4824	Runtime Broker.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 3 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
3336	schtasks.exe
3312	schtasks.exe
3244	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
3692	powershell.exe
3692	powershell.exe
3692	powershell.exe
4376	powershell.exe
4376	powershell.exe
4376	powershell.exe
3888	powershell.exe
3888	powershell.exe
3888	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	3692	powershell.exe
Token: SeIncreaseQuotaPrivilege	3692	powershell.exe
Token: SeSecurityPrivilege	3692	powershell.exe
Token: SeTakeOwnershipPrivilege	3692	powershell.exe
Token: SeLoadDriverPrivilege	3692	powershell.exe
Token: SeSystemProfilePrivilege	3692	powershell.exe
Token: SeSystemtimePrivilege	3692	powershell.exe
Token: SeProfSingleProcessPrivilege	3692	powershell.exe
Token: SeIncBasePriorityPrivilege	3692	powershell.exe
Token: SeCreatePagefilePrivilege	3692	powershell.exe
Token: SeBackupPrivilege	3692	powershell.exe
Token: SeRestorePrivilege	3692	powershell.exe
Token: SeShutdownPrivilege	3692	powershell.exe
Token: SeDebugPrivilege	3692	powershell.exe
Token: SeSystemEnvironmentPrivilege	3692	powershell.exe
Token: SeRemoteShutdownPrivilege	3692	powershell.exe
Token: SeUndockPrivilege	3692	powershell.exe
Token: SeManageVolumePrivilege	3692	powershell.exe
Token: 33	3692	powershell.exe
Token: 34	3692	powershell.exe
Token: 35	3692	powershell.exe
Token: 36	3692	powershell.exe
Token: SeDebugPrivilege	4740	Runtime Broker.exe
Token: SeDebugPrivilege	4376	powershell.exe
Token: SeIncreaseQuotaPrivilege	2384	wmic.exe
Token: SeSecurityPrivilege	2384	wmic.exe
Token: SeTakeOwnershipPrivilege	2384	wmic.exe
Token: SeLoadDriverPrivilege	2384	wmic.exe
Token: SeSystemProfilePrivilege	2384	wmic.exe
Token: SeSystemtimePrivilege	2384	wmic.exe
Token: SeProfSingleProcessPrivilege	2384	wmic.exe
Token: SeIncBasePriorityPrivilege	2384	wmic.exe
Token: SeCreatePagefilePrivilege	2384	wmic.exe
Token: SeBackupPrivilege	2384	wmic.exe
Token: SeRestorePrivilege	2384	wmic.exe
Token: SeShutdownPrivilege	2384	wmic.exe
Token: SeDebugPrivilege	2384	wmic.exe
Token: SeSystemEnvironmentPrivilege	2384	wmic.exe
Token: SeRemoteShutdownPrivilege	2384	wmic.exe
Token: SeUndockPrivilege	2384	wmic.exe
Token: SeManageVolumePrivilege	2384	wmic.exe
Token: 33	2384	wmic.exe
Token: 34	2384	wmic.exe
Token: 35	2384	wmic.exe
Token: 36	2384	wmic.exe
Token: SeIncreaseQuotaPrivilege	2384	wmic.exe
Token: SeSecurityPrivilege	2384	wmic.exe
Token: SeTakeOwnershipPrivilege	2384	wmic.exe
Token: SeLoadDriverPrivilege	2384	wmic.exe
Token: SeSystemProfilePrivilege	2384	wmic.exe
Token: SeSystemtimePrivilege	2384	wmic.exe
Token: SeProfSingleProcessPrivilege	2384	wmic.exe
Token: SeIncBasePriorityPrivilege	2384	wmic.exe
Token: SeCreatePagefilePrivilege	2384	wmic.exe
Token: SeBackupPrivilege	2384	wmic.exe
Token: SeRestorePrivilege	2384	wmic.exe
Token: SeShutdownPrivilege	2384	wmic.exe
Token: SeDebugPrivilege	2384	wmic.exe
Token: SeSystemEnvironmentPrivilege	2384	wmic.exe
Token: SeRemoteShutdownPrivilege	2384	wmic.exe
Token: SeUndockPrivilege	2384	wmic.exe
Token: SeManageVolumePrivilege	2384	wmic.exe
Token: 33	2384	wmic.exe
Token: 34	2384	wmic.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 3648 wrote to memory of 4264	3648	Z1ON Dot Net Obfuscator.exe	73
PID 3648 wrote to memory of 4264	3648	Z1ON Dot Net Obfuscator.exe	73
PID 3648 wrote to memory of 3692	3648	Z1ON Dot Net Obfuscator.exe	74
PID 3648 wrote to memory of 3692	3648	Z1ON Dot Net Obfuscator.exe	74
PID 3648 wrote to memory of 3312	3648	Z1ON Dot Net Obfuscator.exe	77
PID 3648 wrote to memory of 3312	3648	Z1ON Dot Net Obfuscator.exe	77
PID 3648 wrote to memory of 4740	3648	Z1ON Dot Net Obfuscator.exe	79
PID 3648 wrote to memory of 4740	3648	Z1ON Dot Net Obfuscator.exe	79
PID 4264 wrote to memory of 2816	4264	Z1ON Dot Net Obfuscator.exe	80
PID 4264 wrote to memory of 2816	4264	Z1ON Dot Net Obfuscator.exe	80
PID 4264 wrote to memory of 4376	4264	Z1ON Dot Net Obfuscator.exe	81
PID 4264 wrote to memory of 4376	4264	Z1ON Dot Net Obfuscator.exe	81
PID 4740 wrote to memory of 2384	4740	Runtime Broker.exe	83
PID 4740 wrote to memory of 2384	4740	Runtime Broker.exe	83
PID 4264 wrote to memory of 3244	4264	Z1ON Dot Net Obfuscator.exe	87
PID 4264 wrote to memory of 3244	4264	Z1ON Dot Net Obfuscator.exe	87
PID 4264 wrote to memory of 4300	4264	Z1ON Dot Net Obfuscator.exe	88
PID 4264 wrote to memory of 4300	4264	Z1ON Dot Net Obfuscator.exe	88
PID 4300 wrote to memory of 656	4300	Runtime Broker.exe	90
PID 4300 wrote to memory of 656	4300	Runtime Broker.exe	90
PID 2816 wrote to memory of 3856	2816	Z1ON Dot Net Obfuscator.exe	93
PID 2816 wrote to memory of 3856	2816	Z1ON Dot Net Obfuscator.exe	93
PID 2816 wrote to memory of 3888	2816	Z1ON Dot Net Obfuscator.exe	91
PID 2816 wrote to memory of 3888	2816	Z1ON Dot Net Obfuscator.exe	91
PID 2816 wrote to memory of 3336	2816	Z1ON Dot Net Obfuscator.exe	95
PID 2816 wrote to memory of 3336	2816	Z1ON Dot Net Obfuscator.exe	95
PID 2816 wrote to memory of 4824	2816	Z1ON Dot Net Obfuscator.exe	96
PID 2816 wrote to memory of 4824	2816	Z1ON Dot Net Obfuscator.exe	96
PID 4824 wrote to memory of 4508	4824	Runtime Broker.exe	97
PID 4824 wrote to memory of 4508	4824	Runtime Broker.exe	97

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:\Users\Admin\AppData\Local\Temp\Z1ON Dot Net Obfuscator.exe
"C:\Users\Admin\AppData\Local\Temp\Z1ON Dot Net Obfuscator.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3648
- C:\Users\Admin\AppData\Local\Temp\Z1ON Dot Net Obfuscator.exe
  "C:\Users\Admin\AppData\Local\Temp\Z1ON Dot Net Obfuscator.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4264
- - C:\Users\Admin\AppData\Local\Temp\Z1ON Dot Net Obfuscator.exe
    "C:\Users\Admin\AppData\Local\Temp\Z1ON Dot Net Obfuscator.exe"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2816
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe'
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:3888
  - - C:\Users\Admin\AppData\Local\Temp\Z1ON Dot Net Obfuscator.exe
      "C:\Users\Admin\AppData\Local\Temp\Z1ON Dot Net Obfuscator.exe"
      4⤵
      PID:3856
  - - C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /F /TN "Runtime Broker" /SC ONLOGON /TR "C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe" /RL HIGHEST
      4⤵
      Creates scheduled task(s)
      PID:3336
  - - C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe
      "C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of WriteProcessMemory
      PID:4824
    - - C:\Windows\System32\Wbem\wmic.exe
        
        "wmic.exe" csproduct get uuid
        5⤵
        
        PID:4508
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe'
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4376
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /Create /F /TN "Runtime Broker" /SC ONLOGON /TR "C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe" /RL HIGHEST
    3⤵
    - Creates scheduled task(s)
    PID:3244
- - C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe
    "C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of WriteProcessMemory
    PID:4300
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      4⤵
      PID:656
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe'
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3692
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /F /TN "Runtime Broker" /SC ONLOGON /TR "C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe" /RL HIGHEST
  2⤵
  - Creates scheduled task(s)
  PID:3312
- C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe
  "C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4740
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:2384

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Runtime Broker.exe.log

Filesize
1KB

MD5
53ea0a2251276ba7ae39b07e6116d841

SHA1
5f591af152d71b2f04dfc3353a1c96fd4153117d

SHA256
3f7b0412c182cbdefb3eedafe30233d209d734b1087234ac15409636006b3302

SHA512
cf63abfe61389f241755eef4b8ed0f41701568b79d1263e885f8989ce3eca6bf9f8d5805b4cc7304aaaa5c7e14122b0d15bd9948e47108107bbb7219fd498306

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Z1ON Dot Net Obfuscator.exe.log

Filesize
654B

MD5
16c5fce5f7230eea11598ec11ed42862

SHA1
75392d4824706090f5e8907eee1059349c927600

SHA256
87ba77c13905298acbac72be90949c4fe0755b6eff9777615aa37f252515f151

SHA512
153edd6da59beea6cc411ed7383c32916425d6ebb65f04c65aab7c1d6b25443d143aa8449aa92149de0ad8a975f6ecaa60f9f7574536eec6b38fe5fd3a6c6adc

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
1KB

MD5
d3a0eab14343324ab7eb60517edf17a5

SHA1
89d65c504abf8065ceecba9b6ce4d28d3f833065

SHA256
be915bc0100ff5b0664844c54851136d86209b06a9292191275a28ca9c01c18e

SHA512
35e76718359875aacf8cb0cd98d767a7f96d6f38ba545245600065742ba2e1bac2c404e962f3e138717d3baae6e16f728d60f42a8f59004d6307113750a58ce4

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
1KB

MD5
b3d3806092fa8e83b88a3416ee28878d

SHA1
2f7f48bfecd8cfd8ec43fc8467b528611ed2fe47

SHA256
5800560b3fa157481ff8c803743e5a4763e3105b24b25db93066220fdcddb98d

SHA512
74692475f0e5f0b6f3a1474fbc8fe9bb47656114670b47eeff80c38268d7f39cd3ec3284eb326a1f24091be687dc870874d8a406ba7bad9fae5f2048d13df931

Download Submit
C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe

Filesize
211KB

MD5
fba76609bd037849d34c8a1fb27c2fa8

SHA1
536467b289ea5e70afdff1bffdd2d132419f7336

SHA256
6360283c27e88922f159138e661ccc1cd32467cd83a7aa95e9ab6333c693021f

SHA512
febc06726e47ad93500e5051c6e38581d693d23326b987912c91f7c714575ea6be0f2a823e3e31435eb5d23457d094c9aded906a24747e7d5f38d8a3c81d2eb4

Download Submit
C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe

Filesize
227KB

MD5
e55e95e9f14ec4f04735dedc53921773

SHA1
39a664bccf3564cc15341e2df671f79efaf599bd

SHA256
f90239f26adcd67c9e71b6ceb2989ba1c2d95c23363816c622f377a763f6d462

SHA512
939b9368259971de2d3ec6e558cdd22f2ee21e7120ab5293873365e2ffb17b069ee81dae559fc00876764e62576e96fe6ec121c9343b4c840ff8b7a414c26cc6

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_2e1fxaoo.i1p.ps1

Filesize
1B

MD5
c4ca4238a0b923820dcc509a6f75849b

SHA1
356a192b7913b04c54574d18c28d46e6395428ab

SHA256
6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b

SHA512
4dff4ea340f0a823f15d3f4f01ab62eae0e5da579ccb851f8db9dfe84c58b2b37b89903a740e1ee172da793a6e79d560e5f7f9bd058a12a280433ed6fa46510a

Download Submit
memory/2816-123-0x000000001B020000-0x000000001B030000-memory.dmp

Filesize
64KB

Download
memory/2816-177-0x00007FFA90DE0000-0x00007FFA917CC000-memory.dmp

Filesize
9.9MB

Download
memory/2816-66-0x00007FFA90DE0000-0x00007FFA917CC000-memory.dmp

Filesize
9.9MB

Download
memory/2816-131-0x00007FFA90DE0000-0x00007FFA917CC000-memory.dmp

Filesize
9.9MB

Download
memory/3648-0-0x00000000009F0000-0x0000000000BD4000-memory.dmp

Filesize
1.9MB

Download
memory/3648-2-0x000000001B9A0000-0x000000001B9B0000-memory.dmp

Filesize
64KB

Download
memory/3648-1-0x00007FFA90DE0000-0x00007FFA917CC000-memory.dmp

Filesize
9.9MB

Download
memory/3648-61-0x00007FFA90DE0000-0x00007FFA917CC000-memory.dmp

Filesize
9.9MB

Download
memory/3692-10-0x0000019372660000-0x0000019372670000-memory.dmp

Filesize
64KB

Download
memory/3692-52-0x00007FFA90DE0000-0x00007FFA917CC000-memory.dmp

Filesize
9.9MB

Download
memory/3692-50-0x0000019372660000-0x0000019372670000-memory.dmp

Filesize
64KB

Download
memory/3692-27-0x0000019372660000-0x0000019372670000-memory.dmp

Filesize
64KB

Download
memory/3692-14-0x0000019372930000-0x00000193729A6000-memory.dmp

Filesize
472KB

Download
memory/3692-11-0x0000019372880000-0x00000193728A2000-memory.dmp

Filesize
136KB

Download
memory/3692-9-0x0000019372660000-0x0000019372670000-memory.dmp

Filesize
64KB

Download
memory/3692-6-0x00007FFA90DE0000-0x00007FFA917CC000-memory.dmp

Filesize
9.9MB

Download
memory/3856-124-0x00007FFA90DE0000-0x00007FFA917CC000-memory.dmp

Filesize
9.9MB

Download
memory/3856-179-0x00007FFA90DE0000-0x00007FFA917CC000-memory.dmp

Filesize
9.9MB

Download
memory/3888-128-0x00007FFA90DE0000-0x00007FFA917CC000-memory.dmp

Filesize
9.9MB

Download
memory/3888-175-0x00007FFA90DE0000-0x00007FFA917CC000-memory.dmp

Filesize
9.9MB

Download
memory/3888-172-0x000001F1A4D60000-0x000001F1A4D70000-memory.dmp

Filesize
64KB

Download
memory/3888-149-0x000001F1A4D60000-0x000001F1A4D70000-memory.dmp

Filesize
64KB

Download
memory/3888-133-0x000001F1A4D60000-0x000001F1A4D70000-memory.dmp

Filesize
64KB

Download
memory/3888-132-0x000001F1A4D60000-0x000001F1A4D70000-memory.dmp

Filesize
64KB

Download
memory/4264-63-0x000000001B790000-0x000000001B7A0000-memory.dmp

Filesize
64KB

Download
memory/4264-3-0x00007FFA90DE0000-0x00007FFA917CC000-memory.dmp

Filesize
9.9MB

Download
memory/4264-120-0x00007FFA90DE0000-0x00007FFA917CC000-memory.dmp

Filesize
9.9MB

Download
memory/4264-71-0x00007FFA90DE0000-0x00007FFA917CC000-memory.dmp

Filesize
9.9MB

Download
memory/4300-121-0x00007FFA90DE0000-0x00007FFA917CC000-memory.dmp

Filesize
9.9MB

Download
memory/4300-122-0x000001DEE7640000-0x000001DEE7650000-memory.dmp

Filesize
64KB

Download
memory/4300-127-0x00007FFA90DE0000-0x00007FFA917CC000-memory.dmp

Filesize
9.9MB

Download
memory/4376-74-0x000002C418640000-0x000002C418650000-memory.dmp

Filesize
64KB

Download
memory/4376-72-0x00007FFA90DE0000-0x00007FFA917CC000-memory.dmp

Filesize
9.9MB

Download
memory/4376-90-0x000002C418640000-0x000002C418650000-memory.dmp

Filesize
64KB

Download
memory/4376-73-0x000002C418640000-0x000002C418650000-memory.dmp

Filesize
64KB

Download
memory/4376-115-0x000002C418640000-0x000002C418650000-memory.dmp

Filesize
64KB

Download
memory/4376-117-0x00007FFA90DE0000-0x00007FFA917CC000-memory.dmp

Filesize
9.9MB

Download
memory/4740-95-0x00007FFA90DE0000-0x00007FFA917CC000-memory.dmp

Filesize
9.9MB

Download
memory/4740-64-0x000001CF5BAC0000-0x000001CF5BAD0000-memory.dmp

Filesize
64KB

Download
memory/4740-62-0x00007FFA90DE0000-0x00007FFA917CC000-memory.dmp

Filesize
9.9MB

Download
memory/4740-60-0x000001CF41460000-0x000001CF414A0000-memory.dmp

Filesize
256KB

Download
memory/4824-181-0x00007FFA90DE0000-0x00007FFA917CC000-memory.dmp

Filesize
9.9MB

Download
memory/4824-178-0x00007FFA90DE0000-0x00007FFA917CC000-memory.dmp

Filesize
9.9MB

Download
memory/4824-180-0x000002BAB0E00000-0x000002BAB0E10000-memory.dmp

Filesize
64KB

Download