isrstealer | 821861515a96751140747b59f4a4ab0945db40c648bd47172588430a3e4f8de3

Analysis

max time kernel
117s
max time network
118s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
22/03/2025, 12:04

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General

Target

WhySoSerious 1.1.exe
Size

489KB
MD5

92f9f0c7511954d81dcf3c9a82ae718b
SHA1

6cea37af9d6044b446f322e3c7ea58b15b126a90
SHA256

987e7591865d74ef7398282a7921b83236a75df8bfeb29263fba3e650fd255da
SHA512

580879d223d823a0ccaef9db852759b58504fd9d75afc60e03d71ba541c89f6bcdaade96ec668e7567f335bb6db36912502cc109569b5fcaedff96d149af9b56
SSDEEP

12288:VK2mhAMJ/cPlqmuGfIzdRimjx5fxfbQzrje4PIVY4Nc9B1Mul0bOW03Ok:02O/GlqSIzdPP5zQ/jR8Y4y9TZGw

Score

10^/10

isrstealer discovery 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 1 IoCs

resource	yara_rule
behavioral1/files/0x0008000000016c62-37.dat	family_isrstealer

Isrstealer family
isrstealer

Executes dropped EXE 4 IoCs

pid	Process
2400	eeeee.exe
2920	WhySoSerious.exe
2740	tsl.exe
2640	tsl.exe

Loads dropped DLL 9 IoCs

pid	Process
1916	WhySoSerious 1.1.exe
1916	WhySoSerious 1.1.exe
1916	WhySoSerious 1.1.exe
1916	WhySoSerious 1.1.exe
1916	WhySoSerious 1.1.exe
1916	WhySoSerious 1.1.exe
1916	WhySoSerious 1.1.exe
1916	WhySoSerious 1.1.exe
2740	tsl.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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2740 set thread context of 2640	2740	tsl.exe	33

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2640-46-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2640-49-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2640-48-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2640-47-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2640-44-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2640-54-0x0000000000400000-0x0000000000453000-memory.dmp	upx

Drops file in Program Files directory 6 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\XingCode	WhySoSerious 1.1.exe
File created	C:\Program Files (x86)\XingCode\__tmp_rar_sfx_access_check_259424467	WhySoSerious 1.1.exe
File created	C:\Program Files (x86)\XingCode\WhySoSerious.exe	WhySoSerious 1.1.exe
File opened for modification	C:\Program Files (x86)\XingCode\WhySoSerious.exe	WhySoSerious 1.1.exe
File created	C:\Program Files (x86)\XingCode\eeeee.exe	WhySoSerious 1.1.exe
File opened for modification	C:\Program Files (x86)\XingCode\eeeee.exe	WhySoSerious 1.1.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tsl.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WhySoSerious 1.1.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WhySoSerious.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tsl.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2400	eeeee.exe
Token: 33	2400	eeeee.exe
Token: SeIncBasePriorityPrivilege	2400	eeeee.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2740	tsl.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1916 wrote to memory of 2400	1916	WhySoSerious 1.1.exe	30
PID 1916 wrote to memory of 2400	1916	WhySoSerious 1.1.exe	30
PID 1916 wrote to memory of 2400	1916	WhySoSerious 1.1.exe	30
PID 1916 wrote to memory of 2400	1916	WhySoSerious 1.1.exe	30
PID 1916 wrote to memory of 2920	1916	WhySoSerious 1.1.exe	31
PID 1916 wrote to memory of 2920	1916	WhySoSerious 1.1.exe	31
PID 1916 wrote to memory of 2920	1916	WhySoSerious 1.1.exe	31
PID 1916 wrote to memory of 2920	1916	WhySoSerious 1.1.exe	31
PID 1916 wrote to memory of 2920	1916	WhySoSerious 1.1.exe	31
PID 1916 wrote to memory of 2920	1916	WhySoSerious 1.1.exe	31
PID 1916 wrote to memory of 2920	1916	WhySoSerious 1.1.exe	31
PID 2400 wrote to memory of 2740	2400	eeeee.exe	32
PID 2400 wrote to memory of 2740	2400	eeeee.exe	32
PID 2400 wrote to memory of 2740	2400	eeeee.exe	32
PID 2400 wrote to memory of 2740	2400	eeeee.exe	32
PID 2400 wrote to memory of 2740	2400	eeeee.exe	32
PID 2400 wrote to memory of 2740	2400	eeeee.exe	32
PID 2400 wrote to memory of 2740	2400	eeeee.exe	32
PID 2740 wrote to memory of 2640	2740	tsl.exe	33
PID 2740 wrote to memory of 2640	2740	tsl.exe	33
PID 2740 wrote to memory of 2640	2740	tsl.exe	33
PID 2740 wrote to memory of 2640	2740	tsl.exe	33
PID 2740 wrote to memory of 2640	2740	tsl.exe	33
PID 2740 wrote to memory of 2640	2740	tsl.exe	33
PID 2740 wrote to memory of 2640	2740	tsl.exe	33
PID 2740 wrote to memory of 2640	2740	tsl.exe	33
PID 2740 wrote to memory of 2640	2740	tsl.exe	33
PID 2740 wrote to memory of 2640	2740	tsl.exe	33
PID 2740 wrote to memory of 2640	2740	tsl.exe	33
PID 2740 wrote to memory of 2640	2740	tsl.exe	33

C:\Users\Admin\AppData\Local\Temp\WhySoSerious 1.1.exe
"C:\Users\Admin\AppData\Local\Temp\WhySoSerious 1.1.exe"
1⤵
- Loads dropped DLL
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1916
- C:\Program Files (x86)\XingCode\eeeee.exe
  "C:\Program Files (x86)\XingCode\eeeee.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2400
- - C:\Users\Admin\AppData\Local\Temp\tsl.exe
    "C:\Users\Admin\AppData\Local\Temp\tsl.exe"
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2740
  - - C:\Users\Admin\AppData\Local\Temp\tsl.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\tmp.ini"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      PID:2640
- C:\Program Files (x86)\XingCode\WhySoSerious.exe
  "C:\Program Files (x86)\XingCode\WhySoSerious.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  PID:2920

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
196KB

MD5
ab7499ab0b88802c99c38d9f3c74bbd4

SHA1
29f5330608db90ec7c6758dd512c35bc138d080e

SHA256
73b6fac674f30d1cf2d09486d9e0b3a3b4ea799e8c1fae1358c20a49c68d7430

SHA512
84fb7ca98096b68b8249d046b682df5ec7228a00f0bdb7a9abf30827b068b351e728d77ffa1f9f8547bf6637028acb951e9d946119d32e234c629a17d96f6de7

Download Submit
\Program Files (x86)\XingCode\WhySoSerious.exe

Filesize
52KB

MD5
808be1df3c5e7d50cf2f8ad420bcadfa

SHA1
ab38767d75ae1ddff48b6c6193a835089f6ce20b

SHA256
4901e80ce31061e90d173bf18d64843d2aab3d49fc187b588041826bff0a8b54

SHA512
05a82695ddce9205201c14e1a178a789629774b6fddc8c407139b6e5a60f5466ec9a5ddceabc3a4905ca052e54d8475d46815634f3ab7da17f689ab991b62c28

Download Submit
\Program Files (x86)\XingCode\eeeee.exe

Filesize
546KB

MD5
d019bd183105c33e3c962d0941e214d3

SHA1
637da74eaed966242fd530f647beb711b6da1a52

SHA256
b39b26381198044c059d70db6e5d21940abe1ae778d36ebe792947cc20bfe32a

SHA512
501ac1aeaa65bcc1186a93affe07ce8eda28f818b12a106643747d66814a023cb4919427491a6a2afe56771fe72f4b5dc99d7406838d5ed674505825fdf31b26

Download Submit
memory/2400-31-0x0000000000A40000-0x0000000000AC0000-memory.dmp

Filesize
512KB

Download
memory/2400-50-0x0000000000A40000-0x0000000000AC0000-memory.dmp

Filesize
512KB

Download
memory/2640-46-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2640-49-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2640-48-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2640-47-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2640-44-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2640-54-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2920-32-0x0000000000EA0000-0x0000000000EB4000-memory.dmp

Filesize
80KB

Download