isrstealer | 33e595babcf67d43afe50976ab1a20f58c8d737b723fbea915943e89d400e6cb

General

Target

baeaafc9f3d5c944ee7e39d2103e3c87.exe
Size

969KB
MD5

baeaafc9f3d5c944ee7e39d2103e3c87
SHA1

5f2e3c22c8fe2dcfbf8df53ba837cdc0c892f054
SHA256

33e595babcf67d43afe50976ab1a20f58c8d737b723fbea915943e89d400e6cb
SHA512

1b7fae35efd59c1816d50da18eba16ae7d7d014b81c5a773b3a72d03cbc40d8e0a19ae3737f75d595fc4ea5c2c213a42c245c07e0256e1269911823b653654af
SSDEEP

24576:BijCOCdlBNl2HvLxeRNEA/qeRdbfSsfFvEQWQeUoZ7U33SAddBLS:BiGrdlfl2PtsNEA/qe3bKQFvbePOHSAc

Score

10^/10

isrstealer persistence spyware stealer trojan upx

Malware Config

Signatures

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

ISR Stealer payload 3 IoCs

resource	yara_rule
behavioral1/memory/2644-15-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral1/memory/2644-11-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral1/memory/2644-35-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer

Executes dropped EXE 2 IoCs

pid	Process
2644	twitter.exe
2744	twitter.exe

Loads dropped DLL 2 IoCs

pid	Process
2500	baeaafc9f3d5c944ee7e39d2103e3c87.exe
2644	twitter.exe

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

UPX packed file 5 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral1/memory/2744-28-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2744-30-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2744-29-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2744-25-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2744-32-0x0000000000400000-0x0000000000453000-memory.dmp	upx

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-1-5-21-3601492379-692465709-652514833-1000\Software\Microsoft\Windows\CurrentVersion\Run\Fire fox Update = "C:\\Users\\Admin\\AppData\\Local\\Temp\\baeaafc9f3d5c944ee7e39d2103e3c87.exe"	baeaafc9f3d5c944ee7e39d2103e3c87.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2500 set thread context of 2644	2500	baeaafc9f3d5c944ee7e39d2103e3c87.exe	17
PID 2644 set thread context of 2744	2644	twitter.exe	16

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2500	baeaafc9f3d5c944ee7e39d2103e3c87.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2644	twitter.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 2500 wrote to memory of 2644	2500	baeaafc9f3d5c944ee7e39d2103e3c87.exe	17
PID 2500 wrote to memory of 2644	2500	baeaafc9f3d5c944ee7e39d2103e3c87.exe	17
PID 2500 wrote to memory of 2644	2500	baeaafc9f3d5c944ee7e39d2103e3c87.exe	17
PID 2500 wrote to memory of 2644	2500	baeaafc9f3d5c944ee7e39d2103e3c87.exe	17
PID 2500 wrote to memory of 2644	2500	baeaafc9f3d5c944ee7e39d2103e3c87.exe	17
PID 2500 wrote to memory of 2644	2500	baeaafc9f3d5c944ee7e39d2103e3c87.exe	17
PID 2500 wrote to memory of 2644	2500	baeaafc9f3d5c944ee7e39d2103e3c87.exe	17
PID 2500 wrote to memory of 2644	2500	baeaafc9f3d5c944ee7e39d2103e3c87.exe	17
PID 2644 wrote to memory of 2744	2644	twitter.exe	16
PID 2644 wrote to memory of 2744	2644	twitter.exe	16
PID 2644 wrote to memory of 2744	2644	twitter.exe	16
PID 2644 wrote to memory of 2744	2644	twitter.exe	16
PID 2644 wrote to memory of 2744	2644	twitter.exe	16
PID 2644 wrote to memory of 2744	2644	twitter.exe	16
PID 2644 wrote to memory of 2744	2644	twitter.exe	16
PID 2644 wrote to memory of 2744	2644	twitter.exe	16
PID 2644 wrote to memory of 2744	2644	twitter.exe	16

C:\Users\Admin\AppData\Local\Temp\baeaafc9f3d5c944ee7e39d2103e3c87.exe
"C:\Users\Admin\AppData\Local\Temp\baeaafc9f3d5c944ee7e39d2103e3c87.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2500
- C:\Users\Admin\AppData\Local\Temp\twitter.exe
  C:\Users\Admin\AppData\Local\Temp\twitter.exe
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2644

C:\Users\Admin\AppData\Local\Temp\twitter.exe
/scomma "C:\Users\Admin\AppData\Local\Temp\UGb4vUbKaU.ini"
1⤵
- Executes dropped EXE
PID:2744

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

memory/2500-20-0x00000000742F0000-0x000000007489B000-memory.dmp

Filesize
5.7MB

Download
memory/2500-0-0x00000000742F0000-0x000000007489B000-memory.dmp

Filesize
5.7MB

Download
memory/2500-1-0x00000000742F0000-0x000000007489B000-memory.dmp

Filesize
5.7MB

Download
memory/2500-2-0x0000000000150000-0x0000000000190000-memory.dmp

Filesize
256KB

Download
memory/2644-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2644-21-0x00000000002A0000-0x00000000002FF000-memory.dmp

Filesize
380KB

Download
memory/2644-15-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/2644-11-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/2644-9-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/2644-7-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/2644-35-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/2744-25-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2744-29-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2744-30-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2744-28-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2744-32-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads