stealc | 5db2fc5f376d55b644d5584107cbe2a5905927b97d7f440addbf552f85141908

Analysis

max time kernel
146s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20250619-en
resource tags

arch:x64arch:x86image:win10v2004-20250619-enlocale:en-usos:windows10-2004-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__	iYdrQyhOpCOG.exe

Downloads MZ/PE file 1 IoCs

flow	pid	Process
31	4364	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	iYdrQyhOpCOG.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	iYdrQyhOpCOG.exe

Checks computer location settings 2 TTPs 1 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-1-5-21-1419306801-3438187156-704942707-1000\Control Panel\International\Geo\Nation	Loader.exe

Executes dropped EXE 2 IoCs

pid	Process
4752	iYdrQyhOpCOG.exe
1804	BoLLPUs8wgFB.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
behavioral1/files/0x00070000000240cd-34.dat	themida
behavioral1/memory/4752-44-0x0000000140000000-0x00000001407D6000-memory.dmp	themida
behavioral1/memory/4752-45-0x0000000140000000-0x00000001407D6000-memory.dmp	themida
behavioral1/memory/4752-46-0x0000000140000000-0x00000001407D6000-memory.dmp	themida
behavioral1/memory/4752-61-0x0000000140000000-0x00000001407D6000-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	iYdrQyhOpCOG.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
5408	timeout.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4364	Loader.exe
4364	Loader.exe
4752	iYdrQyhOpCOG.exe
4752	iYdrQyhOpCOG.exe
1804	BoLLPUs8wgFB.exe
1804	BoLLPUs8wgFB.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1804	BoLLPUs8wgFB.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 4364 wrote to memory of 4312	4364	Loader.exe	86
PID 4364 wrote to memory of 4312	4364	Loader.exe	86
PID 4364 wrote to memory of 4312	4364	Loader.exe	86
PID 4364 wrote to memory of 4752	4364	Loader.exe	93
PID 4364 wrote to memory of 4752	4364	Loader.exe	93
PID 4364 wrote to memory of 1804	4364	Loader.exe	95
PID 4364 wrote to memory of 1804	4364	Loader.exe	95
PID 4364 wrote to memory of 4500	4364	Loader.exe	96
PID 4364 wrote to memory of 4500	4364	Loader.exe	96
PID 4500 wrote to memory of 5408	4500	cmd.exe	98
PID 4500 wrote to memory of 5408	4500	cmd.exe	98

C:\Users\Admin\AppData\Local\Temp\Loader.exe
"C:\Users\Admin\AppData\Local\Temp\Loader.exe"
1⤵
- Downloads MZ/PE file
- Checks computer location settings
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4364
- C:\Program Files\Google\Chrome\Application\chrome.exe
  "C:\Program Files\Google\Chrome\Application\chrome.exe"
  2⤵
  PID:4312
- C:\Users\Admin\Documents\iYdrQyhOpCOG.exe
  "C:\Users\Admin\Documents\iYdrQyhOpCOG.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:4752
- C:\Users\Admin\Documents\BoLLPUs8wgFB.exe
  "C:\Users\Admin\Documents\BoLLPUs8wgFB.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1804
- 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:4500
- - C:\Windows\system32\timeout.exe
    timeout /t 5
    3⤵
    - Delays execution with timeout.exe
    PID:5408

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:6136

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

B7E267EE-8BE9-E8B2-5556-61DA0D3E5982.txt

Path C:\ProgramData\B7E267EE-8BE9-E8B2-5556-61DA0D3E5982.txt
Size 64B
SHA256 ea3d5eb8d8b1c3b432d57f7d622b97d37756aef0272371374d121224ebdadfad
MD5 866ac82f00638f13e1f7938c7a515f21
SHA1 4797f2b121769e12580dbb505668a72aa38cab15
SHA512 f6ff1310c269a7ad2a53270b443af521cf52c949c6a2d5fc421a5e1337f2d336210e95669979f1d2076ff51d3bd4b4a4d32ba59afd418e39e90ddf19d4b4e7e6
MD5 SHA1 SHA512

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BoLLPUs8wgFB.exe

Path C:\Users\Admin\Documents\BoLLPUs8wgFB.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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iYdrQyhOpCOG.exe

Path C:\Users\Admin\Documents\iYdrQyhOpCOG.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/1804-57-0x0000000140000000-0x0000000140B9F000-memory.dmp

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memory/4364-1-0x00007FF62B4A0000-0x00007FF62C3AB000-memory.dmp

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memory/4752-44-0x0000000140000000-0x00000001407D6000-memory.dmp

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memory/4752-45-0x0000000140000000-0x00000001407D6000-memory.dmp

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memory/4752-46-0x0000000140000000-0x00000001407D6000-memory.dmp

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memory/4752-61-0x0000000140000000-0x00000001407D6000-memory.dmp

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