stealc | 5db2fc5f376d55b644d5584107cbe2a5905927b97d7f440addbf552f85141908

Analysis

max time kernel
41s
max time network
42s
platform
windows11-21h2_x64
resource
win11-20250610-en
resource tags

arch:x64arch:x86image:win11-20250610-enlocale:en-usos:windows11-21h2-x64system
submitted
07/10/2025, 19:35

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General

Target
Loader.exe
Size 9.4MB
Sample251007-ya5m7axyex
SHA256 5db2fc5f376d55b644d5584107cbe2a5905927b97d7f440addbf552f85141908
MD5 99cbf82597a9817ce8cd1c3463582a1f
SHA1 9d5fc2dfcfaa5648fa3eb2638a10eb93ed126700
SHA512 ee182c8a86eda563e9a15f23ce4ba9bc02e491fe3397630ae227359a2c79f610e94b1b8faefcd2b4a3c83c14404ff13993e2783f000eb35883d22b04c66ec383
SSDEEP 196608:SCL8l3YGasbnk08J65VzYNy765DbV+ZfjdT4qTE/9mfGuE:xLKYHJFGzGy+Bgf5RcDr
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

nagibator defense_evasion discovery stealc spyware stealer themida trojan

Malware Config

Extracted

Family

stealc

Botnet

nagibator

http://178.16.54.175

Attributes

url_path
/e9762ff07e084dbb.php

rc4.plain

Signatures

Stealc
Stealc is an infostealer written in C++.
stealer stealc
Stealc family
stealc

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs

defense_evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	Ka5XmVX73qBe.exe

Downloads MZ/PE file 1 IoCs

flow	pid	Process
3	1168	Loader.exe

Checks BIOS information in registry 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	Ka5XmVX73qBe.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	Ka5XmVX73qBe.exe

Executes dropped EXE 2 IoCs

pid	Process
4932	Ka5XmVX73qBe.exe
4428	H5jsivfpQyyn.exe

Reads user/profile data of web browsers 3 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

Credentials from Web Browsers
T1555.003

Themida packer 5 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral2/files/0x0003000000025722-34.dat	themida
behavioral2/memory/4932-44-0x0000000140000000-0x00000001407D6000-memory.dmp	themida
behavioral2/memory/4932-45-0x0000000140000000-0x00000001407D6000-memory.dmp	themida
behavioral2/memory/4932-46-0x0000000140000000-0x00000001407D6000-memory.dmp	themida
behavioral2/memory/4932-62-0x0000000140000000-0x00000001407D6000-memory.dmp	themida

Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials In Files
T1552.001
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Checks whether UAC is enabled 1 TTPs 1 IoCs

defense_evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	Ka5XmVX73qBe.exe

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

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	Loader.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	Loader.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
5032	timeout.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1168	Loader.exe
1168	Loader.exe
4932	Ka5XmVX73qBe.exe
4932	Ka5XmVX73qBe.exe
4428	H5jsivfpQyyn.exe
4428	H5jsivfpQyyn.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4428	H5jsivfpQyyn.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 1168 wrote to memory of 4016	1168	Loader.exe	78
PID 1168 wrote to memory of 4016	1168	Loader.exe	78
PID 1168 wrote to memory of 4016	1168	Loader.exe	78
PID 1168 wrote to memory of 4932	1168	Loader.exe	80
PID 1168 wrote to memory of 4932	1168	Loader.exe	80
PID 1168 wrote to memory of 4428	1168	Loader.exe	82
PID 1168 wrote to memory of 4428	1168	Loader.exe	82
PID 1168 wrote to memory of 2216	1168	Loader.exe	83
PID 1168 wrote to memory of 2216	1168	Loader.exe	83
PID 2216 wrote to memory of 5032	2216	cmd.exe	85
PID 2216 wrote to memory of 5032	2216	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\Loader.exe
"C:\Users\Admin\AppData\Local\Temp\Loader.exe"
1⤵
- Downloads MZ/PE file
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1168
- C:\Program Files\Google\Chrome\Application\chrome.exe
  "C:\Program Files\Google\Chrome\Application\chrome.exe"
  2⤵
  PID:4016
- C:\Users\Admin\Documents\Ka5XmVX73qBe.exe
  "C:\Users\Admin\Documents\Ka5XmVX73qBe.exe"
  2⤵
  - Identifies VirtualBox via ACPI registry values (likely anti-VM)
  - Checks BIOS information in registry
  - Executes dropped EXE
  - Checks whether UAC is enabled
  - Suspicious behavior: EnumeratesProcesses
  PID:4932
- C:\Users\Admin\Documents\H5jsivfpQyyn.exe
  "C:\Users\Admin\Documents\H5jsivfpQyyn.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4428
- C:\Windows\system32\cmd.exe
  "C:\Windows\system32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\Loader.exe
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2216
- - C:\Windows\system32\timeout.exe
    timeout /t 5
    3⤵
    - Delays execution with timeout.exe
    PID:5032

C:\Program Files\Google\Chrome\Application\133.0.6943.60\elevation_service.exe
"C:\Program Files\Google\Chrome\Application\133.0.6943.60\elevation_service.exe"
1⤵
PID:1396

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

001DE06C-F353-D840-6F74-AB0807FC8350.txt

Path C:\ProgramData\001DE06C-F353-D840-6F74-AB0807FC8350.txt
Size 64B
SHA256 a3896b1c83be3160027e4e8321db4453032b8e2e350c602c15a4aec2c6e8e32c
MD5 916a5e37530e48dd45d6f239a967c6da
SHA1 a97edd26944d8bcad3c1aff884765f63f8489f44
SHA512 09fb2adcd0f6f807305cb66e5b9038da470937008dc01df01719647a8b443ec88b7eadeb7d0a81d2eb35131538ee248d71d0fef5575855d6e53c3f30514b88c2
MD5 SHA1 SHA512

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H5jsivfpQyyn.exe

Path C:\Users\Admin\Documents\H5jsivfpQyyn.exe
Size 3.7MB
SHA256 50e809f10fab0077de3df34cb1a3982eebb82e39e2ef11941df0457fa7f0237d
MD5 c36b1f66992a45d3695019c89d9e1c05
SHA1 ed3d84d87012d151586de7b7ed0c53eb04b60a96
SHA512 b5715994655ade62240d204515dca6d5c8242c623b39f64b5cb8cf3ae9673cb492624be670266ebedeff51684f5ef238dd6f04de4daa941b2ac1aa754e1553ad
SSDEEP 98304:L51t9j+08L45dDulNbVvY/DlgjgjyFVUYn5pPmByYe49DLgZ:L51Ty0mYdSlNbdicgjCR59mIYe49M
MD5 SHA1 SHA512 SSDEEP

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Ka5XmVX73qBe.exe

Path C:\Users\Admin\Documents\Ka5XmVX73qBe.exe
Size 7.6MB
SHA256 b7cab933cecac27e965a0940a2e83d1c7f13892f4489fc7c8d6c4bcabe45d7eb
MD5 3f338199eb9979d6bbf031e49b82f513
SHA1 8e9661b55f510e1b960def03ee7dc9242224a344
SHA512 e2e2fd6c34f44bf298ffc1c95fe6041bc4f886b9a9666d791a4f996a746100898f2a13a21fda3e411fa966a15eea7a1523861aa7074158e7f77045c3a20cadd4
SSDEEP 98304:qVjzPrRdz2hIezNK4UKjqC1EZR5zY6cWB8xUT3RRExVKYksWvIeFSWfotJF:KTddzGIez4+ORfB823qcYkwOuJF
MD5 SHA1 SHA512 SSDEEP

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memory/1168-0-0x00007FF773ED0000-0x00007FF774DDB000-memory.dmp

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memory/4428-57-0x0000000140000000-0x0000000140B9F000-memory.dmp

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memory/4932-44-0x0000000140000000-0x00000001407D6000-memory.dmp

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memory/4932-45-0x0000000140000000-0x00000001407D6000-memory.dmp

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memory/4932-46-0x0000000140000000-0x00000001407D6000-memory.dmp

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memory/4932-62-0x0000000140000000-0x00000001407D6000-memory.dmp

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