umbral | b5015182ecaa7561f27090fb7b2aab0decbbffc94606225b12676dc720266498

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
05-06-2024 17:57

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General

Target

C37Bootstrapper.exe
Size

407KB
MD5

2a25b9d935c4fe0a9f85251ecabfd923
SHA1

bebbdce90e0ba9eb1cf388f0db17dbb97775e9e2
SHA256

b5015182ecaa7561f27090fb7b2aab0decbbffc94606225b12676dc720266498
SHA512

08f31d8e8867fcdadb209d28ad3f654b694fe5ec19a289871d758ab75d7759f08c4b8f01c789be22c2e83dafa8ec9e861479003e1e091038074471c701bf9dbf
SSDEEP

6144:oloZMLrIkd8g+EtXHkv/iD4I7lXrRiK1AwBzOurZpjb8e1mVi4qkRH:2oZ0L+EP8I7lXrRiK1AwBzOurzr4J

Score

10^/10

umbral execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral2/memory/5092-0-0x000001F0C5BC0000-0x000001F0C5C2C000-memory.dmp	family_umbral

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

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
3232	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	C37Bootstrapper.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

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
20	discord.com
21	discord.com

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
9	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
2656	wmic.exe

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
5092	C37Bootstrapper.exe
3232	powershell.exe
3232	powershell.exe
5108	powershell.exe
5108	powershell.exe
5036	powershell.exe
5036	powershell.exe
1040	powershell.exe
1040	powershell.exe
436	powershell.exe
436	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	5092	C37Bootstrapper.exe
Token: SeIncreaseQuotaPrivilege	3936	wmic.exe
Token: SeSecurityPrivilege	3936	wmic.exe
Token: SeTakeOwnershipPrivilege	3936	wmic.exe
Token: SeLoadDriverPrivilege	3936	wmic.exe
Token: SeSystemProfilePrivilege	3936	wmic.exe
Token: SeSystemtimePrivilege	3936	wmic.exe
Token: SeProfSingleProcessPrivilege	3936	wmic.exe
Token: SeIncBasePriorityPrivilege	3936	wmic.exe
Token: SeCreatePagefilePrivilege	3936	wmic.exe
Token: SeBackupPrivilege	3936	wmic.exe
Token: SeRestorePrivilege	3936	wmic.exe
Token: SeShutdownPrivilege	3936	wmic.exe
Token: SeDebugPrivilege	3936	wmic.exe
Token: SeSystemEnvironmentPrivilege	3936	wmic.exe
Token: SeRemoteShutdownPrivilege	3936	wmic.exe
Token: SeUndockPrivilege	3936	wmic.exe
Token: SeManageVolumePrivilege	3936	wmic.exe
Token: 33	3936	wmic.exe
Token: 34	3936	wmic.exe
Token: 35	3936	wmic.exe
Token: 36	3936	wmic.exe
Token: SeIncreaseQuotaPrivilege	3936	wmic.exe
Token: SeSecurityPrivilege	3936	wmic.exe
Token: SeTakeOwnershipPrivilege	3936	wmic.exe
Token: SeLoadDriverPrivilege	3936	wmic.exe
Token: SeSystemProfilePrivilege	3936	wmic.exe
Token: SeSystemtimePrivilege	3936	wmic.exe
Token: SeProfSingleProcessPrivilege	3936	wmic.exe
Token: SeIncBasePriorityPrivilege	3936	wmic.exe
Token: SeCreatePagefilePrivilege	3936	wmic.exe
Token: SeBackupPrivilege	3936	wmic.exe
Token: SeRestorePrivilege	3936	wmic.exe
Token: SeShutdownPrivilege	3936	wmic.exe
Token: SeDebugPrivilege	3936	wmic.exe
Token: SeSystemEnvironmentPrivilege	3936	wmic.exe
Token: SeRemoteShutdownPrivilege	3936	wmic.exe
Token: SeUndockPrivilege	3936	wmic.exe
Token: SeManageVolumePrivilege	3936	wmic.exe
Token: 33	3936	wmic.exe
Token: 34	3936	wmic.exe
Token: 35	3936	wmic.exe
Token: 36	3936	wmic.exe
Token: SeDebugPrivilege	3232	powershell.exe
Token: SeDebugPrivilege	5108	powershell.exe
Token: SeDebugPrivilege	5036	powershell.exe
Token: SeDebugPrivilege	1040	powershell.exe
Token: SeIncreaseQuotaPrivilege	1944	wmic.exe
Token: SeSecurityPrivilege	1944	wmic.exe
Token: SeTakeOwnershipPrivilege	1944	wmic.exe
Token: SeLoadDriverPrivilege	1944	wmic.exe
Token: SeSystemProfilePrivilege	1944	wmic.exe
Token: SeSystemtimePrivilege	1944	wmic.exe
Token: SeProfSingleProcessPrivilege	1944	wmic.exe
Token: SeIncBasePriorityPrivilege	1944	wmic.exe
Token: SeCreatePagefilePrivilege	1944	wmic.exe
Token: SeBackupPrivilege	1944	wmic.exe
Token: SeRestorePrivilege	1944	wmic.exe
Token: SeShutdownPrivilege	1944	wmic.exe
Token: SeDebugPrivilege	1944	wmic.exe
Token: SeSystemEnvironmentPrivilege	1944	wmic.exe
Token: SeRemoteShutdownPrivilege	1944	wmic.exe
Token: SeUndockPrivilege	1944	wmic.exe
Token: SeManageVolumePrivilege	1944	wmic.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 5092 wrote to memory of 3936	5092	C37Bootstrapper.exe	84
PID 5092 wrote to memory of 3936	5092	C37Bootstrapper.exe	84
PID 5092 wrote to memory of 3232	5092	C37Bootstrapper.exe	87
PID 5092 wrote to memory of 3232	5092	C37Bootstrapper.exe	87
PID 5092 wrote to memory of 5108	5092	C37Bootstrapper.exe	90
PID 5092 wrote to memory of 5108	5092	C37Bootstrapper.exe	90
PID 5092 wrote to memory of 5036	5092	C37Bootstrapper.exe	92
PID 5092 wrote to memory of 5036	5092	C37Bootstrapper.exe	92
PID 5092 wrote to memory of 1040	5092	C37Bootstrapper.exe	96
PID 5092 wrote to memory of 1040	5092	C37Bootstrapper.exe	96
PID 5092 wrote to memory of 1944	5092	C37Bootstrapper.exe	98
PID 5092 wrote to memory of 1944	5092	C37Bootstrapper.exe	98
PID 5092 wrote to memory of 4092	5092	C37Bootstrapper.exe	100
PID 5092 wrote to memory of 4092	5092	C37Bootstrapper.exe	100
PID 5092 wrote to memory of 3316	5092	C37Bootstrapper.exe	102
PID 5092 wrote to memory of 3316	5092	C37Bootstrapper.exe	102
PID 5092 wrote to memory of 436	5092	C37Bootstrapper.exe	104
PID 5092 wrote to memory of 436	5092	C37Bootstrapper.exe	104
PID 5092 wrote to memory of 2656	5092	C37Bootstrapper.exe	107
PID 5092 wrote to memory of 2656	5092	C37Bootstrapper.exe	107

C:\Users\Admin\AppData\Local\Temp\C37Bootstrapper.exe
"C:\Users\Admin\AppData\Local\Temp\C37Bootstrapper.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5092
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3936
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\C37Bootstrapper.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3232
- 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:5108
- 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:5036
- 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:1040
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1944
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:4092
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:3316
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:436
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:2656

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

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

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

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

Filesize
944B

MD5
77d622bb1a5b250869a3238b9bc1402b

SHA1
d47f4003c2554b9dfc4c16f22460b331886b191b

SHA256
f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb

SHA512
d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9

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

Filesize
948B

MD5
994d48c590292933efa0627922c9fc59

SHA1
696a9fed9578a4f0f73e598f9d71a0c1f9d04090

SHA256
f61c0e17ef24ce95d3d00170c5553c9b5b536d24c0d8e6e7480b3e2eb3855a02

SHA512
f61d859fc00bf1009e6d72a0536fcd3d95d7f06016ed44dcdc1d91a872dad8abda02c7f409dcb9d0e5ea8c8c75b0d8683a60ea57045639402c37eca9eab77940

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

Filesize
1KB

MD5
276798eeb29a49dc6e199768bc9c2e71

SHA1
5fdc8ccb897ac2df7476fbb07517aca5b7a6205b

SHA256
cd0a1056e8f1b6cb5cb328532239d802f4e2aa8f8fcdc0fcb487684bd68e0dcc

SHA512
0d34fce64bbefc57d64fa6e03ca886952263d5f24df9c1c4cce6a1e8f5a47a9a21e9820f8d38caa7f7b43a52336ce00b738ea18419aaa7c788b72e04ce19e4f2

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

Filesize
1KB

MD5
eeb6ad386d143f278077171fc01a81e8

SHA1
43cff1bd7240965bfb2f10e47c0cec0f94332e2d

SHA256
59d62f9472b4c00b7cae0ee702789fa2b0042c468e4de9421d2430f9973eb00d

SHA512
b40f003e6d97adaaf05809f06d12df01984943d9eb6c44eaeffef90df8de0040373150c9714b11a42db5189b7064eeed0609a39f6f1feb91b05dd1835333e8f2

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_05svcj51.rp2.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/3232-14-0x00007FFF10A10000-0x00007FFF114D1000-memory.dmp

Filesize
10.8MB

Download
memory/3232-17-0x00007FFF10A10000-0x00007FFF114D1000-memory.dmp

Filesize
10.8MB

Download
memory/3232-9-0x0000014474EB0000-0x0000014474ED2000-memory.dmp

Filesize
136KB

Download
memory/3232-3-0x00007FFF10A10000-0x00007FFF114D1000-memory.dmp

Filesize
10.8MB

Download
memory/5092-34-0x000001F0E02A0000-0x000001F0E02BE000-memory.dmp

Filesize
120KB

Download
memory/5092-33-0x000001F0E02D0000-0x000001F0E0320000-memory.dmp

Filesize
320KB

Download
memory/5092-32-0x000001F0E0320000-0x000001F0E0396000-memory.dmp

Filesize
472KB

Download
memory/5092-0-0x000001F0C5BC0000-0x000001F0C5C2C000-memory.dmp

Filesize
432KB

Download
memory/5092-2-0x00007FFF10A10000-0x00007FFF114D1000-memory.dmp

Filesize
10.8MB

Download
memory/5092-70-0x000001F0E03B0000-0x000001F0E03BA000-memory.dmp

Filesize
40KB

Download
memory/5092-71-0x000001F0E0500000-0x000001F0E0512000-memory.dmp

Filesize
72KB

Download
memory/5092-1-0x00007FFF10A13000-0x00007FFF10A15000-memory.dmp

Filesize
8KB

Download
memory/5092-89-0x00007FFF10A10000-0x00007FFF114D1000-memory.dmp

Filesize
10.8MB

Download