isrstealer | 1fbf779d7f1d4dfe9cd3f7c84c6e5763bb77530acc11732563e7abaeaba65a93

Analysis

max time kernel
141s
max time network
127s
platform
windows7_x64
resource
win7-20231129-en
resource tags

arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
submitted
13/03/2024, 03:07

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General

Target

c4d20a36d9f0e1ca758818b3be981779.exe
Size

606KB
MD5

c4d20a36d9f0e1ca758818b3be981779
SHA1

2d55fcb91c41aa7d63f240fc1c5a49c919cc4487
SHA256

1fbf779d7f1d4dfe9cd3f7c84c6e5763bb77530acc11732563e7abaeaba65a93
SHA512

e926955240c20b52d885a3471bd422cf0903e49260595419cdef1851676539b84379c1a6959a8ef9452352035f443052886d0a10c913da91824a0a0ae5e77ffe
SSDEEP

12288:DrVRbtxoNY4psjC6bswqW4jV//1iVs9odGn:DrFuJVMFMie9odO

Score

10^/10

isrstealer persistence spyware 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
behavioral1/memory/2720-31-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral1/memory/2720-45-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer

Executes dropped EXE 4 IoCs

pid	Process
2172	tmp1.exe
1732	tmp2.exe
2720	tmp1.EXE
2524	tmp2.EXE

Loads dropped DLL 6 IoCs

pid	Process
2340	c4d20a36d9f0e1ca758818b3be981779.exe
2340	c4d20a36d9f0e1ca758818b3be981779.exe
2340	c4d20a36d9f0e1ca758818b3be981779.exe
2340	c4d20a36d9f0e1ca758818b3be981779.exe
2172	tmp1.exe
1732	tmp2.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

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-1-5-21-3627615824-4061627003-3019543961-1000\Software\Microsoft\Windows\CurrentVersion\Run\RegEdit = "C:\\Users\\Admin\\AppData\\Roaming\\RegEdit.exe"	tmp2.EXE

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2172 set thread context of 2720	2172	tmp1.exe	30
PID 1732 set thread context of 2524	1732	tmp2.exe	31

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2720	tmp1.EXE
2720	tmp1.EXE
2720	tmp1.EXE
2720	tmp1.EXE

Suspicious use of SetWindowsHookEx 4 IoCs

pid	Process
2340	c4d20a36d9f0e1ca758818b3be981779.exe
2172	tmp1.exe
1732	tmp2.exe
2720	tmp1.EXE

Suspicious use of WriteProcessMemory 28 IoCs

description	pid	Process	procid_target
PID 2340 wrote to memory of 2172	2340	c4d20a36d9f0e1ca758818b3be981779.exe	28
PID 2340 wrote to memory of 2172	2340	c4d20a36d9f0e1ca758818b3be981779.exe	28
PID 2340 wrote to memory of 2172	2340	c4d20a36d9f0e1ca758818b3be981779.exe	28
PID 2340 wrote to memory of 2172	2340	c4d20a36d9f0e1ca758818b3be981779.exe	28
PID 2340 wrote to memory of 1732	2340	c4d20a36d9f0e1ca758818b3be981779.exe	29
PID 2340 wrote to memory of 1732	2340	c4d20a36d9f0e1ca758818b3be981779.exe	29
PID 2340 wrote to memory of 1732	2340	c4d20a36d9f0e1ca758818b3be981779.exe	29
PID 2340 wrote to memory of 1732	2340	c4d20a36d9f0e1ca758818b3be981779.exe	29
PID 2172 wrote to memory of 2720	2172	tmp1.exe	30
PID 2172 wrote to memory of 2720	2172	tmp1.exe	30
PID 2172 wrote to memory of 2720	2172	tmp1.exe	30
PID 2172 wrote to memory of 2720	2172	tmp1.exe	30
PID 2172 wrote to memory of 2720	2172	tmp1.exe	30
PID 2172 wrote to memory of 2720	2172	tmp1.exe	30
PID 2172 wrote to memory of 2720	2172	tmp1.exe	30
PID 2172 wrote to memory of 2720	2172	tmp1.exe	30
PID 2172 wrote to memory of 2720	2172	tmp1.exe	30
PID 1732 wrote to memory of 2524	1732	tmp2.exe	31
PID 1732 wrote to memory of 2524	1732	tmp2.exe	31
PID 1732 wrote to memory of 2524	1732	tmp2.exe	31
PID 1732 wrote to memory of 2524	1732	tmp2.exe	31
PID 1732 wrote to memory of 2524	1732	tmp2.exe	31
PID 1732 wrote to memory of 2524	1732	tmp2.exe	31
PID 1732 wrote to memory of 2524	1732	tmp2.exe	31
PID 1732 wrote to memory of 2524	1732	tmp2.exe	31
PID 1732 wrote to memory of 2524	1732	tmp2.exe	31
PID 1732 wrote to memory of 2524	1732	tmp2.exe	31
PID 1732 wrote to memory of 2524	1732	tmp2.exe	31

C:\Users\Admin\AppData\Local\Temp\c4d20a36d9f0e1ca758818b3be981779.exe
"C:\Users\Admin\AppData\Local\Temp\c4d20a36d9f0e1ca758818b3be981779.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2340
- C:\Users\Admin\AppData\Local\Temp\tmp1.exe
  "C:\Users\Admin\AppData\Local\Temp\tmp1.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2172
- - C:\Users\Admin\AppData\Local\Temp\tmp1.EXE
    "C:\Users\Admin\AppData\Local\Temp\tmp1.EXE"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    PID:2720
- C:\Users\Admin\AppData\Local\Temp\tmp2.exe
  "C:\Users\Admin\AppData\Local\Temp\tmp2.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1732
- - C:\Users\Admin\AppData\Local\Temp\tmp2.EXE
    "C:\Users\Admin\AppData\Local\Temp\tmp2.EXE"
    3⤵
    - Executes dropped EXE
    - Adds Run key to start application
    PID:2524

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp2.exe

Filesize
216KB

MD5
f0c93f442042bbbe985674d671191ed3

SHA1
a9ebbe67032eec48673b42325682859ce06a5e2c

SHA256
9708ceb9b7f76534315948101b2c8493d0c96e8205eee25e7b8a5473f65b997e

SHA512
7e8978c682d0e735f8f7bc16d1fb99136e927c7dc1d6e0fe5be41f0ec0808af9203bf146653f9fe4ac806c91f532144f5b27ac2b9adcb7b3876d4ab02a75e776

Download Submit
\Users\Admin\AppData\Local\Temp\tmp1.exe

Filesize
156KB

MD5
c1cfb778cbfe135b6fb0d2b6b9116b38

SHA1
f90af1a915f603a6acc40c18a5d9e8e6eef8d015

SHA256
b5d32c93e9a815f775489aa2b0ab1f86d45821df344916237746557062d7e8fb

SHA512
8ca72c995233c5c14eb9d1b6d6b1b70f72f03acbfb578743b0da8bce03b36d0d2d7e005feefb2fffd55f803e41f9e17b5be8ccc5a333a34d426545fbb6443b0a

Download Submit
memory/2340-0-0x0000000000400000-0x000000000043C000-memory.dmp

Filesize
240KB

Download
memory/2340-27-0x0000000000400000-0x000000000043C000-memory.dmp

Filesize
240KB

Download
memory/2524-32-0x0000000000400000-0x0000000000429000-memory.dmp

Filesize
164KB

Download
memory/2524-39-0x0000000000400000-0x0000000000429000-memory.dmp

Filesize
164KB

Download
memory/2524-41-0x0000000000400000-0x0000000000429000-memory.dmp

Filesize
164KB

Download
memory/2524-43-0x0000000000400000-0x0000000000429000-memory.dmp

Filesize
164KB

Download
memory/2720-31-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2720-45-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download