isrstealer | e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86

Analysis

max time kernel
55s
max time network
45s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
30/11/2022, 03:05

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General

Target

e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe
Size

2.5MB
MD5

64779a324c694f4cac05c8e3372d3053
SHA1

2e5f8c11099ce0224dacb101b2bc5ee92e8377de
SHA256

e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86
SHA512

2cb876fc4ca93aa05ceb6eb9f468fb94f1779fa4e0930f529abf527ab4898c712383df09ca7ccf93f54fa6ff48545cf79390529aa29dc5bbfd945cdd690d4638
SSDEEP

49152:Phh7f+Uq9lW2fihJUj95VbSZOO+LxVziRLT/9t0lwkYsMzROwVAquhtW:PnkLWuiDUfVbEOJfWRLT/PPsipV/ujW

Score

10^/10

isrstealer 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 4 IoCs

resource	yara_rule
behavioral1/memory/1404-135-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral1/memory/1404-138-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral1/memory/1404-149-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral1/memory/1404-152-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer

Executes dropped EXE 4 IoCs

pid	Process
2000	erUET.exe
2024	kzdqYi.exe
1404	cvtres.exe
1600	cvtres.exe

UPX packed file 7 IoCs

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

upx

resource	yara_rule
behavioral1/files/0x0008000000013300-63.dat	upx
behavioral1/files/0x0008000000013300-65.dat	upx
behavioral1/memory/2024-69-0x0000000000400000-0x0000000000623000-memory.dmp	upx
behavioral1/files/0x0008000000013300-70.dat	upx
behavioral1/memory/2024-130-0x0000000000400000-0x0000000000623000-memory.dmp	upx
behavioral1/memory/1600-150-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1600-151-0x0000000000400000-0x0000000000453000-memory.dmp	upx

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	kzdqYi.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate	kzdqYi.exe

Loads dropped DLL 5 IoCs

pid	Process
1488	e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe
1488	e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe
1488	e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe
2000	erUET.exe
1404	cvtres.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2000 set thread context of 1404	2000	erUET.exe	31
PID 1404 set thread context of 1600	1404	cvtres.exe	32

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

System Information Discovery
T1082

Enumerates system info in registry 2 TTPs 2 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\BaseBoardProduct	kzdqYi.exe
Key created	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS	kzdqYi.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2024	kzdqYi.exe
2000	erUET.exe
2000	erUET.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: 33	2024	kzdqYi.exe
Token: SeIncBasePriorityPrivilege	2024	kzdqYi.exe
Token: 33	2024	kzdqYi.exe
Token: SeIncBasePriorityPrivilege	2024	kzdqYi.exe
Token: SeDebugPrivilege	2000	erUET.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1404	cvtres.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 1488 wrote to memory of 2000	1488	e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe	28
PID 1488 wrote to memory of 2000	1488	e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe	28
PID 1488 wrote to memory of 2000	1488	e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe	28
PID 1488 wrote to memory of 2000	1488	e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe	28
PID 1488 wrote to memory of 2024	1488	e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe	29
PID 1488 wrote to memory of 2024	1488	e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe	29
PID 1488 wrote to memory of 2024	1488	e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe	29
PID 1488 wrote to memory of 2024	1488	e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe	29
PID 2000 wrote to memory of 1404	2000	erUET.exe	31
PID 2000 wrote to memory of 1404	2000	erUET.exe	31
PID 2000 wrote to memory of 1404	2000	erUET.exe	31
PID 2000 wrote to memory of 1404	2000	erUET.exe	31
PID 2000 wrote to memory of 1404	2000	erUET.exe	31
PID 2000 wrote to memory of 1404	2000	erUET.exe	31
PID 2000 wrote to memory of 1404	2000	erUET.exe	31
PID 2000 wrote to memory of 1404	2000	erUET.exe	31
PID 1404 wrote to memory of 1600	1404	cvtres.exe	32
PID 1404 wrote to memory of 1600	1404	cvtres.exe	32
PID 1404 wrote to memory of 1600	1404	cvtres.exe	32
PID 1404 wrote to memory of 1600	1404	cvtres.exe	32
PID 1404 wrote to memory of 1600	1404	cvtres.exe	32
PID 1404 wrote to memory of 1600	1404	cvtres.exe	32
PID 1404 wrote to memory of 1600	1404	cvtres.exe	32
PID 1404 wrote to memory of 1600	1404	cvtres.exe	32
PID 1404 wrote to memory of 1600	1404	cvtres.exe	32
PID 2000 wrote to memory of 1404	2000	erUET.exe	31
PID 2000 wrote to memory of 1404	2000	erUET.exe	31

C:\Users\Admin\AppData\Local\Temp\e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe
"C:\Users\Admin\AppData\Local\Temp\e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1488
- C:\Users\Admin\AppData\Local\Temp\erUET.exe
  "C:\Users\Admin\AppData\Local\Temp\erUET.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2000
- - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
    C:\Users\Admin\AppData\Local\Temp\\cvtres.exe
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    - Suspicious use of SetThreadContext
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1404
  - - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\9XyLxvjbpY.ini"
      4⤵
      Executes dropped EXE
      PID:1600
- C:\Users\Admin\AppData\Local\Temp\kzdqYi.exe
  "C:\Users\Admin\AppData\Local\Temp\kzdqYi.exe"
  2⤵
  - Executes dropped EXE
  - Checks BIOS information in registry
  - Enumerates system info in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2024

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
31KB

MD5
ed797d8dc2c92401985d162e42ffa450

SHA1
0f02fc517c7facc4baefde4fe9467fb6488ebabe

SHA256
b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e

SHA512
e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

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

Filesize
31KB

MD5
ed797d8dc2c92401985d162e42ffa450

SHA1
0f02fc517c7facc4baefde4fe9467fb6488ebabe

SHA256
b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e

SHA512
e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

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

Filesize
31KB

MD5
ed797d8dc2c92401985d162e42ffa450

SHA1
0f02fc517c7facc4baefde4fe9467fb6488ebabe

SHA256
b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e

SHA512
e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

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

Filesize
292KB

MD5
518ce1b2afc2d70896ccf5eea0c931a5

SHA1
3deb8749cd62e882453bc18827ab6f58c2489b07

SHA256
ff2edad3e1d94f659db3522502afab58b8e93339a2a3502c6da46cf88389807c

SHA512
825225674f0908f088897128a11b8c1ff84ceb04b6531c88fc2040a8e3e2ed0e5d60c7ba65cb330fc2b00f9c234853a98c79681cc5e7d238673c8c58dd3495b1

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

Filesize
292KB

MD5
518ce1b2afc2d70896ccf5eea0c931a5

SHA1
3deb8749cd62e882453bc18827ab6f58c2489b07

SHA256
ff2edad3e1d94f659db3522502afab58b8e93339a2a3502c6da46cf88389807c

SHA512
825225674f0908f088897128a11b8c1ff84ceb04b6531c88fc2040a8e3e2ed0e5d60c7ba65cb330fc2b00f9c234853a98c79681cc5e7d238673c8c58dd3495b1

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

Filesize
3.0MB

MD5
101805e8a353950b96986e86a32dda78

SHA1
c507ad2cbcdc7525067301d751564b9c94157e27

SHA256
f74cc391a224498f70d2df82121852fee7d53f0f40926d561e953a8d2dd08e5f

SHA512
42f33d0f506c2034be1e8c5e956602c3d9e090f6744870f08a4a5bdfd93f3bdba2b70995ecc7a9b75ab042a617eda60d2c8ddc2366936d29f44f0bd09d792925

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

Filesize
3.0MB

MD5
101805e8a353950b96986e86a32dda78

SHA1
c507ad2cbcdc7525067301d751564b9c94157e27

SHA256
f74cc391a224498f70d2df82121852fee7d53f0f40926d561e953a8d2dd08e5f

SHA512
42f33d0f506c2034be1e8c5e956602c3d9e090f6744870f08a4a5bdfd93f3bdba2b70995ecc7a9b75ab042a617eda60d2c8ddc2366936d29f44f0bd09d792925

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

Filesize
31KB

MD5
ed797d8dc2c92401985d162e42ffa450

SHA1
0f02fc517c7facc4baefde4fe9467fb6488ebabe

SHA256
b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e

SHA512
e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

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

Filesize
31KB

MD5
ed797d8dc2c92401985d162e42ffa450

SHA1
0f02fc517c7facc4baefde4fe9467fb6488ebabe

SHA256
b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e

SHA512
e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

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

Filesize
292KB

MD5
518ce1b2afc2d70896ccf5eea0c931a5

SHA1
3deb8749cd62e882453bc18827ab6f58c2489b07

SHA256
ff2edad3e1d94f659db3522502afab58b8e93339a2a3502c6da46cf88389807c

SHA512
825225674f0908f088897128a11b8c1ff84ceb04b6531c88fc2040a8e3e2ed0e5d60c7ba65cb330fc2b00f9c234853a98c79681cc5e7d238673c8c58dd3495b1

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

Filesize
292KB

MD5
518ce1b2afc2d70896ccf5eea0c931a5

SHA1
3deb8749cd62e882453bc18827ab6f58c2489b07

SHA256
ff2edad3e1d94f659db3522502afab58b8e93339a2a3502c6da46cf88389807c

SHA512
825225674f0908f088897128a11b8c1ff84ceb04b6531c88fc2040a8e3e2ed0e5d60c7ba65cb330fc2b00f9c234853a98c79681cc5e7d238673c8c58dd3495b1

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

Filesize
3.0MB

MD5
101805e8a353950b96986e86a32dda78

SHA1
c507ad2cbcdc7525067301d751564b9c94157e27

SHA256
f74cc391a224498f70d2df82121852fee7d53f0f40926d561e953a8d2dd08e5f

SHA512
42f33d0f506c2034be1e8c5e956602c3d9e090f6744870f08a4a5bdfd93f3bdba2b70995ecc7a9b75ab042a617eda60d2c8ddc2366936d29f44f0bd09d792925

Download Submit
memory/1404-149-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/1404-152-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/1404-132-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/1404-135-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/1404-133-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/1488-67-0x0000000074E70000-0x000000007541B000-memory.dmp

Filesize
5.7MB

Download
memory/1488-55-0x0000000074E70000-0x000000007541B000-memory.dmp

Filesize
5.7MB

Download
memory/1488-56-0x0000000074E70000-0x000000007541B000-memory.dmp

Filesize
5.7MB

Download
memory/1488-54-0x0000000076DC1000-0x0000000076DC3000-memory.dmp

Filesize
8KB

Download
memory/1600-151-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1600-150-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2000-68-0x0000000074E70000-0x000000007541B000-memory.dmp

Filesize
5.7MB

Download
memory/2000-129-0x0000000074E70000-0x000000007541B000-memory.dmp

Filesize
5.7MB

Download
memory/2000-148-0x0000000074E70000-0x000000007541B000-memory.dmp

Filesize
5.7MB

Download
memory/2024-130-0x0000000000400000-0x0000000000623000-memory.dmp

Filesize
2.1MB

Download
memory/2024-69-0x0000000000400000-0x0000000000623000-memory.dmp

Filesize
2.1MB

Download
memory/2024-71-0x0000000000630000-0x0000000000641000-memory.dmp

Filesize
68KB

Download
memory/2024-79-0x0000000000650000-0x0000000000660000-memory.dmp

Filesize
64KB

Download
memory/2024-87-0x0000000010000000-0x0000000010021000-memory.dmp

Filesize
132KB

Download
memory/2024-95-0x0000000000660000-0x0000000000671000-memory.dmp

Filesize
68KB

Download
memory/2024-103-0x0000000000680000-0x0000000000690000-memory.dmp

Filesize
64KB

Download
memory/2024-128-0x0000000002210000-0x0000000002336000-memory.dmp

Filesize
1.1MB

Download
memory/2024-119-0x00000000006A0000-0x00000000006C0000-memory.dmp

Filesize
128KB

Download
memory/2024-111-0x0000000000690000-0x00000000006A0000-memory.dmp

Filesize
64KB

Download