stealc | bbc7dd5d471b06ed6e6f3ee03bef18e6967cf244bbc1ede6af795de22aaad6a9

Analysis

max time kernel
143s
max time network
161s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
24/12/2023, 08:21

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General

Target
a73814e6836505e8df40a9d256364772.exe
Size 307KB
Sample231224-j81dssbdfr
SHA256 bbc7dd5d471b06ed6e6f3ee03bef18e6967cf244bbc1ede6af795de22aaad6a9
MD5 a73814e6836505e8df40a9d256364772
SHA1 8cf8bfdfb417eefbc757d69786d7bd12c9f16ee0
SHA512 eb0cb0353355a23f99fac08f0be976cae96a67b0819bdcd3d9d78696b9212dd5438fc7873b13367b724c407286065fe8dfeb5756bba44e415848c7a404a6bd4b
SSDEEP 6144:EtbnZdLcg2FBzACwdQdhlxRzZUFPHeZNi2fKVtV:cbnL4n1ACwilkBeJfKPV
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

stealc discovery spyware stealer

Malware Config

Extracted

Family

stealc

http://77.91.76.36

Attributes

url_path
/3886d2276f6914c4.php

rc4.plain

Signatures

Stealc
Stealc is an infostealer written in C++.
stealer stealc
Downloads MZ/PE file

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-1-5-21-1815711207-1844170477-3539718864-1000\Control Panel\International\Geo\Nation	a73814e6836505e8df40a9d256364772.exe

Loads dropped DLL 2 IoCs

pid	Process
384	a73814e6836505e8df40a9d256364772.exe
384	a73814e6836505e8df40a9d256364772.exe

Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
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
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
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4200	384	WerFault.exe	77

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 opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	a73814e6836505e8df40a9d256364772.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	a73814e6836505e8df40a9d256364772.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
396	timeout.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
384	a73814e6836505e8df40a9d256364772.exe
384	a73814e6836505e8df40a9d256364772.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 384 wrote to memory of 4516	384	a73814e6836505e8df40a9d256364772.exe	101
PID 384 wrote to memory of 4516	384	a73814e6836505e8df40a9d256364772.exe	101
PID 384 wrote to memory of 4516	384	a73814e6836505e8df40a9d256364772.exe	101
PID 4516 wrote to memory of 396	4516	cmd.exe	105
PID 4516 wrote to memory of 396	4516	cmd.exe	105
PID 4516 wrote to memory of 396	4516	cmd.exe	105

C:\Users\Admin\AppData\Local\Temp\a73814e6836505e8df40a9d256364772.exe
"C:\Users\Admin\AppData\Local\Temp\a73814e6836505e8df40a9d256364772.exe"
1⤵
- Checks computer location settings
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:384
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\system32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\a73814e6836505e8df40a9d256364772.exe" & del "C:\ProgramData\*.dll"" & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4516
- - C:\Windows\SysWOW64\timeout.exe
    timeout /t 5
    3⤵
    - Delays execution with timeout.exe
    PID:396
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 384 -s 2440
  2⤵
  - Program crash
  PID:4200

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 384 -ip 384
1⤵
PID:5092

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

Are.docx

Path C:\ProgramData\Are.docx
Size 11KB
SHA256 5abf8e3d1f78de7b09d7f6fb87f9e80e60caacf13ef3c1289665653dacd7c454
MD5 a33e5b189842c5867f46566bdbf7a095
SHA1 e1c06359f6a76da90d19e8fd95e79c832edb3196
SHA512 f2ad3812ec9b915e9618539b0f103f2e9acaad25fbbacd84941c954ce070af231324e83a4621e951c1dbae8d40d50410954e40dd52bbd46e34c54b0d1957407b
SSDEEP 192:CtNCEE33S7Ok0CMSYbcBVk6tqM16iPBkeawLWdxd7o3Lp:aNwC78uYbcBv6akwLWdxdE3Lp
MD5 SHA1 SHA512 SSDEEP

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mozglue.dll

Path C:\ProgramData\mozglue.dll
Size 593KB
SHA256 ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a
MD5 c8fd9be83bc728cc04beffafc2907fe9
SHA1 95ab9f701e0024cedfbd312bcfe4e726744c4f2e
SHA512 fbb446f4a27ef510e616caad52945d6c9cc1fd063812c41947e579ec2b54df57c6dc46237ded80fca5847f38cbe1747a6c66a13e2c8c19c664a72be35eb8b040
SSDEEP 12288:BlSyAom/gcRKMdRm4wFkRHuyG4RRGJVDjMk/x21R8gY/r:BKgcRKMdRm4wFkVVDGJVv//x21R8br
MD5 SHA1 SHA512 SSDEEP

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mozglue.dll

Path C:\ProgramData\mozglue.dll
Size 448KB
SHA256 92df8a625452746acfbe72ccc5242d15a0e2985ba7ca9e6ea105561cc1d4d239
MD5 d9cc66ccf417e3644524a76ed74ad577
SHA1 441d703591a55883c496985fe95e51f1d109fa5c
SHA512 25c26a8b154d64f488d38e81e8818174d6733aea2392075977d4cf61dd00128f9114ddd0e0f0e43b8e456fd234dc5bc22fde097080147845e39538cc493f5252
SSDEEP 6144:iKflSyAomPnkYySd0/TYRKHGddwd9Ym4wFkUYwxoHu6D7Vaqntg49hDYo9RuTJE:BlSyAom/gcRKMdRm4wFkRHuyG4RRGJE
MD5 SHA1 SHA512 SSDEEP

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nss3.dll

Path C:\ProgramData\nss3.dll
Size 869KB
SHA256 500fa7e931db400ed7c283b8c447aac14f49817c9b76fdafe6d4a951642c6dc2
MD5 71f8063426825b7f1faf4ae433ae5e90
SHA1 fae2ce371eadbb1993819eebc7abdce88c3333df
SHA512 2eb532422a9cdf34b5454f2d5dc302dc7868f88a6e25f11e0c4228c5bfdd860656c1e70db91cac5f7c02c73a3b58f6e7c884c25098c53b79b213e75c937b52de
SSDEEP 24576:fEggtwf12gyTkHlnKGxJHxIB+y5GNIvxnnt7rczxISEYak3HFOsWYrVvE4C5mxVO:fECf12gikHlnKGxJRIB+y5nvxnaOSJ3e
MD5 SHA1 SHA512 SSDEEP

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memory/384-1-0x00000000007B0000-0x00000000008B0000-memory.dmp

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memory/384-2-0x0000000000790000-0x00000000007AC000-memory.dmp

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memory/384-3-0x0000000000400000-0x000000000062E000-memory.dmp

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memory/384-4-0x0000000061E00000-0x0000000061EF3000-memory.dmp

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memory/384-55-0x0000000000400000-0x000000000062E000-memory.dmp

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memory/384-81-0x0000000000400000-0x000000000062E000-memory.dmp

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memory/384-82-0x00000000007B0000-0x00000000008B0000-memory.dmp

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memory/384-84-0x0000000000400000-0x000000000062E000-memory.dmp

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