umbral | ac8a08a5dd79ab90a206fe5f79c6d0982a3d9f21ea23daae9e0a04a0edd65892

Analysis

max time kernel
92s
max time network
95s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
03-06-2024 09:53

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General

Target

LegacyPhasmo/LegacyPhasmo.exe
Size

495KB
MD5

85946e8adc17bed93bb80005f2caabe7
SHA1

b7941993fc3c58a9a42296b82e43f0988feb2ed9
SHA256

649683f80b00b62ba0979634a6935088637e8b12f91ef8260dfaafa4840d6555
SHA512

331cc3635905ff7673f545c7570cbaae1fa7a7b5637a610d1ce801929d67b527e88cb1e453aa4b1c402ea2565e0e5fa6729d822d38527a6bd8f8e84348c6e51c
SSDEEP

6144:vloZM+rIkd8g+EtXHkv/iD42LM3t74sziKrd4UB8Fb8e1mgi04OA:NoZtL+EP82LM3t74sziKrd4UBsa00

Score

10^/10

umbral execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral2/memory/4492-0-0x0000014382F30000-0x0000014382FB2000-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
4848	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	LegacyPhasmo.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
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
5	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
1496	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1688	PING.EXE

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
4492	LegacyPhasmo.exe
4848	powershell.exe
4848	powershell.exe
3268	powershell.exe
3268	powershell.exe
4104	powershell.exe
4104	powershell.exe
2232	powershell.exe
2232	powershell.exe
4924	powershell.exe
4924	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	4492	LegacyPhasmo.exe
Token: SeIncreaseQuotaPrivilege	2788	wmic.exe
Token: SeSecurityPrivilege	2788	wmic.exe
Token: SeTakeOwnershipPrivilege	2788	wmic.exe
Token: SeLoadDriverPrivilege	2788	wmic.exe
Token: SeSystemProfilePrivilege	2788	wmic.exe
Token: SeSystemtimePrivilege	2788	wmic.exe
Token: SeProfSingleProcessPrivilege	2788	wmic.exe
Token: SeIncBasePriorityPrivilege	2788	wmic.exe
Token: SeCreatePagefilePrivilege	2788	wmic.exe
Token: SeBackupPrivilege	2788	wmic.exe
Token: SeRestorePrivilege	2788	wmic.exe
Token: SeShutdownPrivilege	2788	wmic.exe
Token: SeDebugPrivilege	2788	wmic.exe
Token: SeSystemEnvironmentPrivilege	2788	wmic.exe
Token: SeRemoteShutdownPrivilege	2788	wmic.exe
Token: SeUndockPrivilege	2788	wmic.exe
Token: SeManageVolumePrivilege	2788	wmic.exe
Token: 33	2788	wmic.exe
Token: 34	2788	wmic.exe
Token: 35	2788	wmic.exe
Token: 36	2788	wmic.exe
Token: SeIncreaseQuotaPrivilege	2788	wmic.exe
Token: SeSecurityPrivilege	2788	wmic.exe
Token: SeTakeOwnershipPrivilege	2788	wmic.exe
Token: SeLoadDriverPrivilege	2788	wmic.exe
Token: SeSystemProfilePrivilege	2788	wmic.exe
Token: SeSystemtimePrivilege	2788	wmic.exe
Token: SeProfSingleProcessPrivilege	2788	wmic.exe
Token: SeIncBasePriorityPrivilege	2788	wmic.exe
Token: SeCreatePagefilePrivilege	2788	wmic.exe
Token: SeBackupPrivilege	2788	wmic.exe
Token: SeRestorePrivilege	2788	wmic.exe
Token: SeShutdownPrivilege	2788	wmic.exe
Token: SeDebugPrivilege	2788	wmic.exe
Token: SeSystemEnvironmentPrivilege	2788	wmic.exe
Token: SeRemoteShutdownPrivilege	2788	wmic.exe
Token: SeUndockPrivilege	2788	wmic.exe
Token: SeManageVolumePrivilege	2788	wmic.exe
Token: 33	2788	wmic.exe
Token: 34	2788	wmic.exe
Token: 35	2788	wmic.exe
Token: 36	2788	wmic.exe
Token: SeDebugPrivilege	4848	powershell.exe
Token: SeDebugPrivilege	3268	powershell.exe
Token: SeDebugPrivilege	4104	powershell.exe
Token: SeDebugPrivilege	2232	powershell.exe
Token: SeIncreaseQuotaPrivilege	1860	wmic.exe
Token: SeSecurityPrivilege	1860	wmic.exe
Token: SeTakeOwnershipPrivilege	1860	wmic.exe
Token: SeLoadDriverPrivilege	1860	wmic.exe
Token: SeSystemProfilePrivilege	1860	wmic.exe
Token: SeSystemtimePrivilege	1860	wmic.exe
Token: SeProfSingleProcessPrivilege	1860	wmic.exe
Token: SeIncBasePriorityPrivilege	1860	wmic.exe
Token: SeCreatePagefilePrivilege	1860	wmic.exe
Token: SeBackupPrivilege	1860	wmic.exe
Token: SeRestorePrivilege	1860	wmic.exe
Token: SeShutdownPrivilege	1860	wmic.exe
Token: SeDebugPrivilege	1860	wmic.exe
Token: SeSystemEnvironmentPrivilege	1860	wmic.exe
Token: SeRemoteShutdownPrivilege	1860	wmic.exe
Token: SeUndockPrivilege	1860	wmic.exe
Token: SeManageVolumePrivilege	1860	wmic.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 4492 wrote to memory of 2788	4492	LegacyPhasmo.exe	83
PID 4492 wrote to memory of 2788	4492	LegacyPhasmo.exe	83
PID 4492 wrote to memory of 4400	4492	LegacyPhasmo.exe	87
PID 4492 wrote to memory of 4400	4492	LegacyPhasmo.exe	87
PID 4492 wrote to memory of 4848	4492	LegacyPhasmo.exe	89
PID 4492 wrote to memory of 4848	4492	LegacyPhasmo.exe	89
PID 4492 wrote to memory of 3268	4492	LegacyPhasmo.exe	91
PID 4492 wrote to memory of 3268	4492	LegacyPhasmo.exe	91
PID 4492 wrote to memory of 4104	4492	LegacyPhasmo.exe	93
PID 4492 wrote to memory of 4104	4492	LegacyPhasmo.exe	93
PID 4492 wrote to memory of 2232	4492	LegacyPhasmo.exe	95
PID 4492 wrote to memory of 2232	4492	LegacyPhasmo.exe	95
PID 4492 wrote to memory of 1860	4492	LegacyPhasmo.exe	97
PID 4492 wrote to memory of 1860	4492	LegacyPhasmo.exe	97
PID 4492 wrote to memory of 3300	4492	LegacyPhasmo.exe	99
PID 4492 wrote to memory of 3300	4492	LegacyPhasmo.exe	99
PID 4492 wrote to memory of 4412	4492	LegacyPhasmo.exe	101
PID 4492 wrote to memory of 4412	4492	LegacyPhasmo.exe	101
PID 4492 wrote to memory of 4924	4492	LegacyPhasmo.exe	103
PID 4492 wrote to memory of 4924	4492	LegacyPhasmo.exe	103
PID 4492 wrote to memory of 1496	4492	LegacyPhasmo.exe	105
PID 4492 wrote to memory of 1496	4492	LegacyPhasmo.exe	105
PID 4492 wrote to memory of 4576	4492	LegacyPhasmo.exe	109
PID 4492 wrote to memory of 4576	4492	LegacyPhasmo.exe	109
PID 4576 wrote to memory of 1688	4576	cmd.exe	111
PID 4576 wrote to memory of 1688	4576	cmd.exe	111

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
4400	attrib.exe

C:\Users\Admin\AppData\Local\Temp\LegacyPhasmo\LegacyPhasmo.exe
"C:\Users\Admin\AppData\Local\Temp\LegacyPhasmo\LegacyPhasmo.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4492
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2788
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\LegacyPhasmo\LegacyPhasmo.exe"
  2⤵
  - Views/modifies file attributes
  PID:4400
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\LegacyPhasmo\LegacyPhasmo.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4848
- 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:3268
- 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:4104
- 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:2232
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1860
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:3300
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:4412
- 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:4924
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:1496
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\LegacyPhasmo\LegacyPhasmo.exe" && pause
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4576
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - Runs ping.exe
    PID:1688

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
d28a889fd956d5cb3accfbaf1143eb6f

SHA1
157ba54b365341f8ff06707d996b3635da8446f7

SHA256
21e5d7ccf80a293e6ba30ed728846ca19c929c52b96e2c8d34e27cd2234f1d45

SHA512
0b6d88deb9be85722e6a78d5886d49f2caf407a59e128d2b4ed74c1356f9928c40048a62731959f2460e9ff9d9feee311043d2a37abe3bb92c2b76a44281478c

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

Filesize
948B

MD5
966914e2e771de7a4a57a95b6ecfa8a9

SHA1
7a32282fd51dd032967ed4d9a40cc57e265aeff2

SHA256
98d3c70d7004fa807897317bd6cd3e977b9b6c72d4d2565aca0f9f8b1c315cba

SHA512
dc39c7124a9c7c8d4c7e8e16290c46360b8d9a8f4e43edaacbbeb09bdcf20159a53db54d2b322372001b6a3de52b2f88e9088b5fdbc7638816ae0d122bb015f5

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
ac057a92f4b62d8880169af0693ef5b2

SHA1
66e7c7834c5dae5cec863ccd69403150d05841f4

SHA256
7cef55990e8e6cfe07e1965b303e79ac562cdc128ab82edf480d9873f72bb3ed

SHA512
d525f47da9e61fc87e55aca6b34e776be3ed081b719bbbb5256705a6afe5fdd4c16d5ee595af13994e2718f789f5fd32830331347d97b029c031c9dfe30c7f49

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_5jnrbtxc.5hc.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/4492-71-0x0000014384C10000-0x0000014384C1A000-memory.dmp

Filesize
40KB

Download
memory/4492-35-0x000001439D5D0000-0x000001439D5EE000-memory.dmp

Filesize
120KB

Download
memory/4492-90-0x00007FFCE0910000-0x00007FFCE13D1000-memory.dmp

Filesize
10.8MB

Download
memory/4492-72-0x000001439D5F0000-0x000001439D602000-memory.dmp

Filesize
72KB

Download
memory/4492-2-0x00007FFCE0910000-0x00007FFCE13D1000-memory.dmp

Filesize
10.8MB

Download
memory/4492-33-0x000001439D730000-0x000001439D7A6000-memory.dmp

Filesize
472KB

Download
memory/4492-34-0x0000014384C20000-0x0000014384C70000-memory.dmp

Filesize
320KB

Download
memory/4492-0-0x0000014382F30000-0x0000014382FB2000-memory.dmp

Filesize
520KB

Download
memory/4492-1-0x00007FFCE0913000-0x00007FFCE0915000-memory.dmp

Filesize
8KB

Download
memory/4848-15-0x00007FFCE0910000-0x00007FFCE13D1000-memory.dmp

Filesize
10.8MB

Download
memory/4848-4-0x000001E8641D0000-0x000001E8641F2000-memory.dmp

Filesize
136KB

Download
memory/4848-3-0x00007FFCE0910000-0x00007FFCE13D1000-memory.dmp

Filesize
10.8MB

Download
memory/4848-14-0x00007FFCE0910000-0x00007FFCE13D1000-memory.dmp

Filesize
10.8MB

Download
memory/4848-18-0x00007FFCE0910000-0x00007FFCE13D1000-memory.dmp

Filesize
10.8MB

Download