isrstealer | fd8aea8afeba8a171afc6b81a9c0a418be0b90c7a8cffccb3f1712333377191a

General

Target

fd8aea8afeba8a171afc6b81a9c0a418be0b90c7a8cffccb3f1712333377191a.exe
Size

2.2MB
MD5

306e9be63813dcd81bc3a74871f0a665
SHA1

900848f008d7bcac739b63899821778ce7c13e0f
SHA256

fd8aea8afeba8a171afc6b81a9c0a418be0b90c7a8cffccb3f1712333377191a
SHA512

500431564a290b4500b1a175dbab5d2c50fcea8a93aca1d91bf0658ffc3402134a2fad1820d979f8c2ba2aa9c51519f771d9d64ad45f6147f0d6cf8e0ef36527
SSDEEP

49152:TSxosGgMLBfPxuvwvbTzzNNeICqMCF9g8yUyPzeljVJb6nHAiBvfP:TSx3GggBg4vHPNNBCqM+bv8CLfiBf

Score

10^/10

isrstealer stealer trojan

Malware Config

Signatures

ISR Stealer
ISR Stealer is a modified version of Hackhound Stealer written in visual basic.
trojan stealer isrstealer

ISR Stealer payload 2 IoCs

resource	yara_rule
behavioral2/memory/4988-138-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral2/memory/4988-140-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer

Executes dropped EXE 2 IoCs

pid	Process
1880	explorer.exe
1368	WinRAR411.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-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation	fd8aea8afeba8a171afc6b81a9c0a418be0b90c7a8cffccb3f1712333377191a.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1880 set thread context of 4988	1880	explorer.exe	87

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch.new	explorer.exe
File created	C:\Windows\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch.new	explorer.exe

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
4988	AppLaunch.exe
4988	AppLaunch.exe
4988	AppLaunch.exe
4988	AppLaunch.exe
4988	AppLaunch.exe
4988	AppLaunch.exe
4988	AppLaunch.exe
4988	AppLaunch.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1880	explorer.exe

Suspicious use of SetWindowsHookEx 4 IoCs

pid	Process
4988	AppLaunch.exe
1368	WinRAR411.exe
1368	WinRAR411.exe
1368	WinRAR411.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 2052 wrote to memory of 1880	2052	fd8aea8afeba8a171afc6b81a9c0a418be0b90c7a8cffccb3f1712333377191a.exe	83
PID 2052 wrote to memory of 1880	2052	fd8aea8afeba8a171afc6b81a9c0a418be0b90c7a8cffccb3f1712333377191a.exe	83
PID 2052 wrote to memory of 1880	2052	fd8aea8afeba8a171afc6b81a9c0a418be0b90c7a8cffccb3f1712333377191a.exe	83
PID 1880 wrote to memory of 4988	1880	explorer.exe	87
PID 1880 wrote to memory of 4988	1880	explorer.exe	87
PID 1880 wrote to memory of 4988	1880	explorer.exe	87
PID 1880 wrote to memory of 4988	1880	explorer.exe	87
PID 1880 wrote to memory of 4988	1880	explorer.exe	87
PID 1880 wrote to memory of 4988	1880	explorer.exe	87
PID 1880 wrote to memory of 4988	1880	explorer.exe	87
PID 1880 wrote to memory of 4988	1880	explorer.exe	87
PID 2052 wrote to memory of 1368	2052	fd8aea8afeba8a171afc6b81a9c0a418be0b90c7a8cffccb3f1712333377191a.exe	88
PID 2052 wrote to memory of 1368	2052	fd8aea8afeba8a171afc6b81a9c0a418be0b90c7a8cffccb3f1712333377191a.exe	88
PID 2052 wrote to memory of 1368	2052	fd8aea8afeba8a171afc6b81a9c0a418be0b90c7a8cffccb3f1712333377191a.exe	88

C:\Users\Admin\AppData\Local\Temp\fd8aea8afeba8a171afc6b81a9c0a418be0b90c7a8cffccb3f1712333377191a.exe
"C:\Users\Admin\AppData\Local\Temp\fd8aea8afeba8a171afc6b81a9c0a418be0b90c7a8cffccb3f1712333377191a.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2052
- C:\Users\Admin\AppData\Local\Temp\RarSFX0\explorer.exe
  "C:\Users\Admin\AppData\Local\Temp\RarSFX0\explorer.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Drops file in Windows directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1880
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\AppLaunch.exe
    C:\Windows\Microsoft.NET\Framework\v2.0.50727\AppLaunch.exe
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    PID:4988
- C:\Users\Admin\AppData\Local\Temp\RarSFX0\WinRAR411.exe
  "C:\Users\Admin\AppData\Local\Temp\RarSFX0\WinRAR411.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  PID:1368

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\RarSFX0\WinRAR411.exe

Filesize
2.1MB

MD5
c1e7623669d68d43037419e602f2c238

SHA1
2451c4d95a59d25a933662ad0dcb82eb2772d8e1

SHA256
f1be8608f5324b0ef37384d735850d374c1aebf1c2a5c924d57d981f442c7730

SHA512
80a6a1371b3cdd16b22e0c7eac10973df008f0fcc035db6b0a23afee8943e9cffb71c6a4ad7765326f6f19c8d5a4851bf99648c323a403fb7a2cc60155d6d4f7

Download Submit
C:\Users\Admin\AppData\Local\Temp\RarSFX0\WinRAR411.exe

Filesize
2.1MB

MD5
c1e7623669d68d43037419e602f2c238

SHA1
2451c4d95a59d25a933662ad0dcb82eb2772d8e1

SHA256
f1be8608f5324b0ef37384d735850d374c1aebf1c2a5c924d57d981f442c7730

SHA512
80a6a1371b3cdd16b22e0c7eac10973df008f0fcc035db6b0a23afee8943e9cffb71c6a4ad7765326f6f19c8d5a4851bf99648c323a403fb7a2cc60155d6d4f7

Download Submit
C:\Users\Admin\AppData\Local\Temp\RarSFX0\explorer.exe

Filesize
159KB

MD5
c74cae46f9e11aa24c9dd901b69bc3aa

SHA1
adc3fbb03b059eb07a038c707f9ab449366296f7

SHA256
d9bf94a7c82eca74cca5b512c08e43d87aa5dd50da36cfc2586764013ee813c9

SHA512
37e2e3f8ec95e7ba8f32d0816f023ae916dc103cc086f44db2974b636dc18e88c2715c176012133ec9a747979e02a21d402b6f60547a36695e8701a177642e4d

Download Submit
C:\Users\Admin\AppData\Local\Temp\RarSFX0\explorer.exe

Filesize
159KB

MD5
c74cae46f9e11aa24c9dd901b69bc3aa

SHA1
adc3fbb03b059eb07a038c707f9ab449366296f7

SHA256
d9bf94a7c82eca74cca5b512c08e43d87aa5dd50da36cfc2586764013ee813c9

SHA512
37e2e3f8ec95e7ba8f32d0816f023ae916dc103cc086f44db2974b636dc18e88c2715c176012133ec9a747979e02a21d402b6f60547a36695e8701a177642e4d

Download Submit
memory/1880-135-0x0000000072F80000-0x0000000073531000-memory.dmp

Filesize
5.7MB

Download
memory/1880-136-0x0000000072F80000-0x0000000073531000-memory.dmp

Filesize
5.7MB

Download
memory/1880-142-0x0000000072F80000-0x0000000073531000-memory.dmp

Filesize
5.7MB

Download
memory/4988-138-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/4988-140-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download

Analysis

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