stormkitty | 198a4fc5e976e2c061955169a5577900995b200c0a301f16e8334da1b8390015

General

Target

skrLoader .exe
Size

2.5MB
MD5

c7c055ea5a4ff27236bb9c1bc562d0d9
SHA1

abf36d75c3f195d2d892890d686af86f7eb39123
SHA256

198a4fc5e976e2c061955169a5577900995b200c0a301f16e8334da1b8390015
SHA512

30d1ca92d3c54ae22a1d702f32a698b86aff7c3174ec0557d682d34226d65ea4bbee9f834bf6a4ae788ad4135558bed90a258828b6d1f93c04b55a19b506a8e1
SSDEEP

49152:hUv026HUoB0KrW85+FGRs62zcvx0pCRvmZFw5mCx1CUqBpLfQuDumXoSDLp:50tKrrEBA0oROZFw5mW1CUqBpJbDL

Score

10^/10

stormkitty xworm credential_access discovery evasion execution persistence rat spyware stealer trojan

Malware Config

Extracted

Family

xworm

C2

147.185.221.16:60401

Attributes

Install_directory
%LocalAppData%
install_file
svchost.exe

Signatures

Contains code to disable Windows Defender 1 IoCs

A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

resource	yara_rule
behavioral1/memory/1704-73-0x000000001BAC0000-0x000000001BACE000-memory.dmp	disable_win_def

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral1/files/0x0007000000023412-6.dat	family_xworm
behavioral1/memory/1704-14-0x0000000000070000-0x00000000000CC000-memory.dmp	family_xworm

StormKitty
StormKitty is an open source info stealer written in C#.
stealer stormkitty

StormKitty payload 1 IoCs

resource	yara_rule
behavioral1/memory/1704-75-0x000000001CE50000-0x000000001CF6E000-memory.dmp	family_stormkitty

UAC bypass 3 TTPs 1 IoCs

evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	skrLoader.exe

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Credentials from Password Stores: Credentials from Web Browsers 1 TTPs
Malicious Access or copy of Web Browser Credential store.
credential_access stealer

Credentials from Web Browsers
T1555.003

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

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

execution

PowerShell

T1059.001

pid	Process
4860	powershell.exe
4672	powershell.exe
4456	powershell.exe
2768	powershell.exe

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-464762018-485119342-1613148473-1000\Control Panel\International\Geo\Nation	skrLoader.exe
Key value queried	\REGISTRY\USER\S-1-5-21-464762018-485119342-1613148473-1000\Control Panel\International\Geo\Nation	skrLoader .exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svchost.lnk	skrLoader.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svchost.lnk	skrLoader.exe

Executes dropped EXE 2 IoCs

pid	Process
1704	skrLoader.exe
2896	svchost.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

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-464762018-485119342-1613148473-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\svchost = "C:\\Users\\Admin\\AppData\\Local\\svchost.exe"	skrLoader.exe

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
7	ip-api.com

Browser Information Discovery 1 TTPs
Enumerate browser information.
discovery

Browser Information Discovery
T1217
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Checks SCSI registry key(s) 3 TTPs 3 IoCs

SCSI information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000	taskmgr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000\Properties\{b725f130-47ef-101a-a5f1-02608c9eebac}\000A	taskmgr.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000\FriendlyName	taskmgr.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
764	schtasks.exe

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
4860	powershell.exe
4860	powershell.exe
4672	powershell.exe
4672	powershell.exe
4456	powershell.exe
4456	powershell.exe
2768	powershell.exe
2768	powershell.exe
1704	skrLoader.exe
4300	taskmgr.exe
4300	taskmgr.exe

Suspicious use of AdjustPrivilegeToken 10 IoCs

description	pid	Process
Token: SeDebugPrivilege	1704	skrLoader.exe
Token: SeDebugPrivilege	4860	powershell.exe
Token: SeDebugPrivilege	4672	powershell.exe
Token: SeDebugPrivilege	4456	powershell.exe
Token: SeDebugPrivilege	2768	powershell.exe
Token: SeDebugPrivilege	1704	skrLoader.exe
Token: SeDebugPrivilege	2896	svchost.exe
Token: SeDebugPrivilege	4300	taskmgr.exe
Token: SeSystemProfilePrivilege	4300	taskmgr.exe
Token: SeCreateGlobalPrivilege	4300	taskmgr.exe

Suspicious use of FindShellTrayWindow 13 IoCs

pid	Process
4300	taskmgr.exe
4300	taskmgr.exe
4300	taskmgr.exe
4300	taskmgr.exe
4300	taskmgr.exe
4300	taskmgr.exe
4300	taskmgr.exe
4300	taskmgr.exe
4300	taskmgr.exe
4300	taskmgr.exe
4300	taskmgr.exe
4300	taskmgr.exe
4300	taskmgr.exe

Suspicious use of SendNotifyMessage 13 IoCs

pid	Process
4300	taskmgr.exe
4300	taskmgr.exe
4300	taskmgr.exe
4300	taskmgr.exe
4300	taskmgr.exe
4300	taskmgr.exe
4300	taskmgr.exe
4300	taskmgr.exe
4300	taskmgr.exe
4300	taskmgr.exe
4300	taskmgr.exe
4300	taskmgr.exe
4300	taskmgr.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1704	skrLoader.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 1380 wrote to memory of 1704	1380	skrLoader .exe	85
PID 1380 wrote to memory of 1704	1380	skrLoader .exe	85
PID 1704 wrote to memory of 4860	1704	skrLoader.exe	90
PID 1704 wrote to memory of 4860	1704	skrLoader.exe	90
PID 1704 wrote to memory of 4672	1704	skrLoader.exe	92
PID 1704 wrote to memory of 4672	1704	skrLoader.exe	92
PID 1704 wrote to memory of 4456	1704	skrLoader.exe	94
PID 1704 wrote to memory of 4456	1704	skrLoader.exe	94
PID 1704 wrote to memory of 2768	1704	skrLoader.exe	98
PID 1704 wrote to memory of 2768	1704	skrLoader.exe	98
PID 1704 wrote to memory of 764	1704	skrLoader.exe	101
PID 1704 wrote to memory of 764	1704	skrLoader.exe	101

System policy modification 1 TTPs 2 IoCs

evasion

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\software\microsoft\windows\currentversion\policies\system	skrLoader.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	skrLoader.exe

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\skrLoader .exe
"C:\Users\Admin\AppData\Local\Temp\skrLoader .exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1380
- C:\Users\Admin\AppData\Local\Temp\skrLoader.exe
  "C:\Users\Admin\AppData\Local\Temp\skrLoader.exe"
  2⤵
  - UAC bypass
  - Checks computer location settings
  - Drops startup file
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  - System policy modification
  PID:1704
- - 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\skrLoader.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4860
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'skrLoader.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4672
- - 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\svchost.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4456
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'svchost.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2768
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "svchost" /tr "C:\Users\Admin\AppData\Local\svchost.exe"
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:764

C:\Users\Admin\AppData\Local\svchost.exe
C:\Users\Admin\AppData\Local\svchost.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2896

C:\Windows\system32\taskmgr.exe
"C:\Windows\system32\taskmgr.exe" /4
1⤵
- Checks SCSI registry key(s)
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
PID:4300

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Impair Defenses

1

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Browser Information Discovery

1

T1217

Peripheral Device Discovery

Query Registry

System Information Discovery

3

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

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
2e907f77659a6601fcc408274894da2e

SHA1
9f5b72abef1cd7145bf37547cdb1b9254b4efe9d

SHA256
385da35673330e21ac02545220552fe301fe54dedefbdafc097ac4342a295233

SHA512
34fa0fff24f6550f55f828541aaefe5d75c86f8f0842d54b50065e9746f9662bb7209c74c9a9571540b9855bb3851f01db613190024e89b198d485bb5dc07721

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

Filesize
944B

MD5
110b59ca4d00786d0bde151d21865049

SHA1
557e730d93fdf944a0cad874022df1895fb5b2e2

SHA256
77f69011c214ea5a01fd2035d781914c4893aee66d784deadc22179eadfdf77f

SHA512
cb55ac6eca50f4427718bace861679c88b2fdfea94d30209e8d61ca73a6ce9f8c4b5334922d2660a829b0636d20cbdf3bae1497c920e604efe6c636019feb10e

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

Filesize
944B

MD5
67e8893616f805af2411e2f4a1411b2a

SHA1
39bf1e1a0ddf46ce7c136972120f512d92827dcd

SHA256
ca0dfe104c1bf27f7e01999fcdabc16c6400c3da937c832c26bdbca322381d31

SHA512
164e911a9935e75c8be1a6ec3d31199a16ba2a1064da6c09d771b2a38dd7fddd142301ef55d67d90f306d3a454a1ce7b72e129ea42e44500b9b8c623a8d98b4d

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_mtbpvy5k.pvl.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

Filesize
341KB

MD5
75b4370a5fe8e5f843eacd1c694d3db8

SHA1
a6fe91f8106df544d1a5b98fae6b377145de62cc

SHA256
a4d85bdf88ada754657d54096f09fee088e47902ad7037297db04d89d48714d2

SHA512
270c2f55d84203eb2b653831b64e557fe40c7066f0b2eea6967f31932e975859b7848d121e68cb6e17929ad5a0f47c5f4ff23869910a6f6f25e385408e83820e

Download Submit
memory/1380-0-0x00007FFD45423000-0x00007FFD45425000-memory.dmp

Filesize
8KB

Download
memory/1380-1-0x0000000000890000-0x0000000000B22000-memory.dmp

Filesize
2.6MB

Download
memory/1704-75-0x000000001CE50000-0x000000001CF6E000-memory.dmp

Filesize
1.1MB

Download
memory/1704-17-0x00007FFD45420000-0x00007FFD45EE1000-memory.dmp

Filesize
10.8MB

Download
memory/1704-16-0x00007FFD45420000-0x00007FFD45EE1000-memory.dmp

Filesize
10.8MB

Download
memory/1704-14-0x0000000000070000-0x00000000000CC000-memory.dmp

Filesize
368KB

Download
memory/1704-68-0x00007FFD45420000-0x00007FFD45EE1000-memory.dmp

Filesize
10.8MB

Download
memory/1704-69-0x00007FFD45420000-0x00007FFD45EE1000-memory.dmp

Filesize
10.8MB

Download
memory/1704-73-0x000000001BAC0000-0x000000001BACE000-memory.dmp

Filesize
56KB

Download
memory/4300-115-0x0000029712F40000-0x0000029712F41000-memory.dmp

Filesize
4KB

Download
memory/4300-114-0x0000029712F40000-0x0000029712F41000-memory.dmp

Filesize
4KB

Download
memory/4300-116-0x0000029712F40000-0x0000029712F41000-memory.dmp

Filesize
4KB

Download
memory/4300-125-0x0000029712F40000-0x0000029712F41000-memory.dmp

Filesize
4KB

Download
memory/4300-126-0x0000029712F40000-0x0000029712F41000-memory.dmp

Filesize
4KB

Download
memory/4300-122-0x0000029712F40000-0x0000029712F41000-memory.dmp

Filesize
4KB

Download
memory/4300-121-0x0000029712F40000-0x0000029712F41000-memory.dmp

Filesize
4KB

Download
memory/4300-120-0x0000029712F40000-0x0000029712F41000-memory.dmp

Filesize
4KB

Download
memory/4300-124-0x0000029712F40000-0x0000029712F41000-memory.dmp

Filesize
4KB

Download
memory/4300-123-0x0000029712F40000-0x0000029712F41000-memory.dmp

Filesize
4KB

Download
memory/4860-23-0x0000019979270000-0x0000019979292000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads