isrstealer | e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86

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
behavioral2/memory/648-145-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/648-160-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/648-211-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/648-212-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer

Executes dropped EXE 3 IoCs

pid	Process
3492	OapLn.exe
3468	iWZwK.exe
648	cvtres.exe

UPX packed file 3 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x0006000000022e35-139.dat	upx
behavioral2/files/0x0006000000022e35-138.dat	upx
behavioral2/memory/3468-142-0x0000000000400000-0x0000000000623000-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	iWZwK.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate	iWZwK.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-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation	e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3492 set thread context of 648	3492	OapLn.exe	91
PID 648 set thread context of 0	648	cvtres.exe

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 created	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS	iWZwK.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\BaseBoardProduct	iWZwK.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3492	OapLn.exe
3492	OapLn.exe
3468	iWZwK.exe
3468	iWZwK.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	3492	OapLn.exe
Token: 33	3468	iWZwK.exe
Token: SeIncBasePriorityPrivilege	3468	iWZwK.exe
Token: 33	3468	iWZwK.exe
Token: SeIncBasePriorityPrivilege	3468	iWZwK.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
648	cvtres.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 4488 wrote to memory of 3492	4488	e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe	89
PID 4488 wrote to memory of 3492	4488	e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe	89
PID 4488 wrote to memory of 3492	4488	e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe	89
PID 4488 wrote to memory of 3468	4488	e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe	90
PID 4488 wrote to memory of 3468	4488	e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe	90
PID 4488 wrote to memory of 3468	4488	e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe	90
PID 3492 wrote to memory of 648	3492	OapLn.exe	91
PID 3492 wrote to memory of 648	3492	OapLn.exe	91
PID 3492 wrote to memory of 648	3492	OapLn.exe	91
PID 3492 wrote to memory of 648	3492	OapLn.exe	91
PID 3492 wrote to memory of 648	3492	OapLn.exe	91
PID 3492 wrote to memory of 648	3492	OapLn.exe	91
PID 3492 wrote to memory of 648	3492	OapLn.exe	91
PID 3492 wrote to memory of 648	3492	OapLn.exe	91
PID 3492 wrote to memory of 648	3492	OapLn.exe	91
PID 3492 wrote to memory of 648	3492	OapLn.exe	91
PID 648 wrote to memory of 0	648	cvtres.exe
PID 648 wrote to memory of 0	648	cvtres.exe
PID 648 wrote to memory of 0	648	cvtres.exe
PID 648 wrote to memory of 0	648	cvtres.exe
PID 648 wrote to memory of 0	648	cvtres.exe

C:\Users\Admin\AppData\Local\Temp\e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe
"C:\Users\Admin\AppData\Local\Temp\e334453a140e582a902b55a29758b1fc0db6e948ba0090b5431ffbf7a3d9fb86.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4488
- C:\Users\Admin\AppData\Local\Temp\OapLn.exe
  "C:\Users\Admin\AppData\Local\Temp\OapLn.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3492
- - C:\Users\Admin\AppData\Local\Temp\cvtres.exe
    C:\Users\Admin\AppData\Local\Temp\\cvtres.exe
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:648
- C:\Users\Admin\AppData\Local\Temp\iWZwK.exe
  "C:\Users\Admin\AppData\Local\Temp\iWZwK.exe"
  2⤵
  - Executes dropped EXE
  - Checks BIOS information in registry
  - Enumerates system info in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3468

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

3

T1012

System Information Discovery

4

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
292KB

MD5
518ce1b2afc2d70896ccf5eea0c931a5

SHA1
3deb8749cd62e882453bc18827ab6f58c2489b07

SHA256
ff2edad3e1d94f659db3522502afab58b8e93339a2a3502c6da46cf88389807c

SHA512
825225674f0908f088897128a11b8c1ff84ceb04b6531c88fc2040a8e3e2ed0e5d60c7ba65cb330fc2b00f9c234853a98c79681cc5e7d238673c8c58dd3495b1

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

Filesize
292KB

MD5
518ce1b2afc2d70896ccf5eea0c931a5

SHA1
3deb8749cd62e882453bc18827ab6f58c2489b07

SHA256
ff2edad3e1d94f659db3522502afab58b8e93339a2a3502c6da46cf88389807c

SHA512
825225674f0908f088897128a11b8c1ff84ceb04b6531c88fc2040a8e3e2ed0e5d60c7ba65cb330fc2b00f9c234853a98c79681cc5e7d238673c8c58dd3495b1

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

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

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

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

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

Filesize
3.0MB

MD5
101805e8a353950b96986e86a32dda78

SHA1
c507ad2cbcdc7525067301d751564b9c94157e27

SHA256
f74cc391a224498f70d2df82121852fee7d53f0f40926d561e953a8d2dd08e5f

SHA512
42f33d0f506c2034be1e8c5e956602c3d9e090f6744870f08a4a5bdfd93f3bdba2b70995ecc7a9b75ab042a617eda60d2c8ddc2366936d29f44f0bd09d792925

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

Filesize
3.0MB

MD5
101805e8a353950b96986e86a32dda78

SHA1
c507ad2cbcdc7525067301d751564b9c94157e27

SHA256
f74cc391a224498f70d2df82121852fee7d53f0f40926d561e953a8d2dd08e5f

SHA512
42f33d0f506c2034be1e8c5e956602c3d9e090f6744870f08a4a5bdfd93f3bdba2b70995ecc7a9b75ab042a617eda60d2c8ddc2366936d29f44f0bd09d792925

Download Submit
memory/0-167-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/648-212-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/648-211-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/648-160-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/648-145-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/3468-203-0x0000000002E40000-0x0000000002E60000-memory.dmp

Filesize
128KB

Download
memory/3468-195-0x0000000002E30000-0x0000000002E40000-memory.dmp

Filesize
64KB

Download
memory/3468-187-0x0000000002E20000-0x0000000002E30000-memory.dmp

Filesize
64KB

Download
memory/3468-149-0x0000000002AA0000-0x0000000002AB1000-memory.dmp

Filesize
68KB

Download
memory/3468-179-0x0000000002E00000-0x0000000002E11000-memory.dmp

Filesize
68KB

Download
memory/3468-159-0x0000000000C50000-0x0000000000C60000-memory.dmp

Filesize
64KB

Download
memory/3468-142-0x0000000000400000-0x0000000000623000-memory.dmp

Filesize
2.1MB

Download
memory/3468-163-0x0000000002650000-0x0000000002776000-memory.dmp

Filesize
1.1MB

Download
memory/3468-171-0x0000000010000000-0x0000000010021000-memory.dmp

Filesize
132KB

Download
memory/3492-143-0x0000000074FC0000-0x0000000075571000-memory.dmp

Filesize
5.7MB

Download
memory/3492-152-0x0000000074FC0000-0x0000000075571000-memory.dmp

Filesize
5.7MB

Download
memory/3492-141-0x0000000074FC0000-0x0000000075571000-memory.dmp

Filesize
5.7MB

Download
memory/4488-133-0x0000000074FC0000-0x0000000075571000-memory.dmp

Filesize
5.7MB

Download
memory/4488-140-0x0000000074FC0000-0x0000000075571000-memory.dmp

Filesize
5.7MB

Download
memory/4488-132-0x0000000074FC0000-0x0000000075571000-memory.dmp

Filesize
5.7MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads