isrstealer | 4eb5ebeab6568c03038f634aab8eed323c8a20af0e1d42d0c3fefed749d8b179

Analysis

max time kernel
137s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
23-11-2022 09:43

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General

Target

4eb5ebeab6568c03038f634aab8eed323c8a20af0e1d42d0c3fefed749d8b179.exe
Size

515KB
MD5

d13fd13e55b7b1d5707dd505eb2cb535
SHA1

7f6263b93bbb00ecc673a19278f7ff70f5610314
SHA256

4eb5ebeab6568c03038f634aab8eed323c8a20af0e1d42d0c3fefed749d8b179
SHA512

fd11af81b6ae23f204f32340752d18b800a55ed99d8453a84d5a072134c6141a12a3afff45670a7a00887b4f8be1a80289849851d9494d5f0ce6386370ece00a
SSDEEP

12288:KZpt2dmNJ3ipl5Ma8nssH40lGEZCXZb+3n0guvW:Kpkdm7+70sg8pby0Le

Score

10^/10

isrstealer collection 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

Processes:

resource	yara_rule
behavioral2/memory/2248-141-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2248-158-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2248-167-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

Processes:

resource	yara_rule
behavioral2/memory/4736-165-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/4736-166-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4736-165-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/4736-166-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

Executes dropped EXE 6 IoCs

Processes:

bot.exeserver.exebot.exeserver.exeserver.exeserver.exe

pid process

4568 bot.exe
2568 server.exe
1028 bot.exe
2248 server.exe
5076 server.exe
4736 server.exe

pid	process
4568	bot.exe
2568	server.exe
1028	bot.exe
2248	server.exe
5076	server.exe
4736	server.exe

UPX packed file 8 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/5076-152-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5076-155-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5076-156-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5076-157-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4736-161-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4736-164-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4736-165-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4736-166-0x0000000000400000-0x000000000041F000-memory.dmp	upx

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

Processes:

4eb5ebeab6568c03038f634aab8eed323c8a20af0e1d42d0c3fefed749d8b179.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	4eb5ebeab6568c03038f634aab8eed323c8a20af0e1d42d0c3fefed749d8b179.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
T1081

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

Processes:

server.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	server.exe

Suspicious use of SetThreadContext 4 IoCs

Processes:

bot.exeserver.exeserver.exe

description	pid	process	target process
PID 4568 set thread context of 1028	4568	bot.exe	bot.exe
PID 2568 set thread context of 2248	2568	server.exe	server.exe
PID 2248 set thread context of 5076	2248	server.exe	server.exe
PID 2248 set thread context of 4736	2248	server.exe	server.exe

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

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 8 IoCs

Processes:

server.exebot.exe

pid process

2568 server.exe
2568 server.exe
4568 bot.exe
4568 bot.exe
2568 server.exe
4568 bot.exe
2568 server.exe
4568 bot.exe
Suspicious use of SetWindowsHookEx 5 IoCs

Processes:

bot.exeserver.exeserver.exe

pid process

4568 bot.exe
4568 bot.exe
2568 server.exe
2568 server.exe
2248 server.exe

pid	process
2568	server.exe
2568	server.exe
4568	bot.exe
4568	bot.exe
2568	server.exe
4568	bot.exe
2568	server.exe
4568	bot.exe

pid	process
4568	bot.exe
4568	bot.exe
2568	server.exe
2568	server.exe
2248	server.exe

Suspicious use of WriteProcessMemory 38 IoCs

Processes:

4eb5ebeab6568c03038f634aab8eed323c8a20af0e1d42d0c3fefed749d8b179.exebot.exeserver.exeserver.exe

description	pid	process	target process
PID 5040 wrote to memory of 4568	5040	4eb5ebeab6568c03038f634aab8eed323c8a20af0e1d42d0c3fefed749d8b179.exe	bot.exe
PID 5040 wrote to memory of 4568	5040	4eb5ebeab6568c03038f634aab8eed323c8a20af0e1d42d0c3fefed749d8b179.exe	bot.exe
PID 5040 wrote to memory of 4568	5040	4eb5ebeab6568c03038f634aab8eed323c8a20af0e1d42d0c3fefed749d8b179.exe	bot.exe
PID 5040 wrote to memory of 2568	5040	4eb5ebeab6568c03038f634aab8eed323c8a20af0e1d42d0c3fefed749d8b179.exe	server.exe
PID 5040 wrote to memory of 2568	5040	4eb5ebeab6568c03038f634aab8eed323c8a20af0e1d42d0c3fefed749d8b179.exe	server.exe
PID 5040 wrote to memory of 2568	5040	4eb5ebeab6568c03038f634aab8eed323c8a20af0e1d42d0c3fefed749d8b179.exe	server.exe
PID 4568 wrote to memory of 1028	4568	bot.exe	bot.exe
PID 4568 wrote to memory of 1028	4568	bot.exe	bot.exe
PID 4568 wrote to memory of 1028	4568	bot.exe	bot.exe
PID 2568 wrote to memory of 2248	2568	server.exe	server.exe
PID 2568 wrote to memory of 2248	2568	server.exe	server.exe
PID 2568 wrote to memory of 2248	2568	server.exe	server.exe
PID 4568 wrote to memory of 1028	4568	bot.exe	bot.exe
PID 4568 wrote to memory of 1028	4568	bot.exe	bot.exe
PID 4568 wrote to memory of 1028	4568	bot.exe	bot.exe
PID 4568 wrote to memory of 1028	4568	bot.exe	bot.exe
PID 4568 wrote to memory of 1028	4568	bot.exe	bot.exe
PID 2568 wrote to memory of 2248	2568	server.exe	server.exe
PID 2568 wrote to memory of 2248	2568	server.exe	server.exe
PID 2568 wrote to memory of 2248	2568	server.exe	server.exe
PID 2568 wrote to memory of 2248	2568	server.exe	server.exe
PID 2568 wrote to memory of 2248	2568	server.exe	server.exe
PID 2248 wrote to memory of 5076	2248	server.exe	server.exe
PID 2248 wrote to memory of 5076	2248	server.exe	server.exe
PID 2248 wrote to memory of 5076	2248	server.exe	server.exe
PID 2248 wrote to memory of 5076	2248	server.exe	server.exe
PID 2248 wrote to memory of 5076	2248	server.exe	server.exe
PID 2248 wrote to memory of 5076	2248	server.exe	server.exe
PID 2248 wrote to memory of 5076	2248	server.exe	server.exe
PID 2248 wrote to memory of 5076	2248	server.exe	server.exe
PID 2248 wrote to memory of 4736	2248	server.exe	server.exe
PID 2248 wrote to memory of 4736	2248	server.exe	server.exe
PID 2248 wrote to memory of 4736	2248	server.exe	server.exe
PID 2248 wrote to memory of 4736	2248	server.exe	server.exe
PID 2248 wrote to memory of 4736	2248	server.exe	server.exe
PID 2248 wrote to memory of 4736	2248	server.exe	server.exe
PID 2248 wrote to memory of 4736	2248	server.exe	server.exe
PID 2248 wrote to memory of 4736	2248	server.exe	server.exe

C:\Users\Admin\AppData\Local\Temp\4eb5ebeab6568c03038f634aab8eed323c8a20af0e1d42d0c3fefed749d8b179.exe
"C:\Users\Admin\AppData\Local\Temp\4eb5ebeab6568c03038f634aab8eed323c8a20af0e1d42d0c3fefed749d8b179.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:5040

C:\Users\Admin\AppData\Local\Temp\bot.exe
"C:\Users\Admin\AppData\Local\Temp\bot.exe"
2⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4568

C:\Users\Admin\AppData\Local\Temp\bot.exe
C:\Users\Admin\AppData\Local\Temp\bot.exe
3⤵
- Executes dropped EXE
PID:1028

C:\Users\Admin\AppData\Local\Temp\server.exe
"C:\Users\Admin\AppData\Local\Temp\server.exe"
2⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2568

C:\Users\Admin\AppData\Local\Temp\server.exe
C:\Users\Admin\AppData\Local\Temp\server.exe
3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2248

C:\Users\Admin\AppData\Local\Temp\server.exe
/scomma "C:\Users\Admin\AppData\Local\Temp\z78Iq5sL7E.ini"
4⤵
- Executes dropped EXE
PID:5076

C:\Users\Admin\AppData\Local\Temp\server.exe
/scomma "C:\Users\Admin\AppData\Local\Temp\NcEGpYrPVO.ini"
4⤵
- Executes dropped EXE
- Accesses Microsoft Outlook accounts
PID:4736

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
204KB

MD5
505c7f710af70ee6ac134fef275aecb5

SHA1
99b05ced9f301ee91967efe31bf2c0cae9deb61c

SHA256
1b95691fec48024a4f2db839f9afc893248ea4ff75ef160706d9e3bcb41565f9

SHA512
1b1ad3504cd631404c6b162f7998ac084c71d7ad3ba9c27ce11c0a6227254859e06a86d9e67a9e296b789d668aafb4c5bc540d2098884027e989af9e82e23686

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

Filesize
204KB

MD5
505c7f710af70ee6ac134fef275aecb5

SHA1
99b05ced9f301ee91967efe31bf2c0cae9deb61c

SHA256
1b95691fec48024a4f2db839f9afc893248ea4ff75ef160706d9e3bcb41565f9

SHA512
1b1ad3504cd631404c6b162f7998ac084c71d7ad3ba9c27ce11c0a6227254859e06a86d9e67a9e296b789d668aafb4c5bc540d2098884027e989af9e82e23686

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

Filesize
204KB

MD5
505c7f710af70ee6ac134fef275aecb5

SHA1
99b05ced9f301ee91967efe31bf2c0cae9deb61c

SHA256
1b95691fec48024a4f2db839f9afc893248ea4ff75ef160706d9e3bcb41565f9

SHA512
1b1ad3504cd631404c6b162f7998ac084c71d7ad3ba9c27ce11c0a6227254859e06a86d9e67a9e296b789d668aafb4c5bc540d2098884027e989af9e82e23686

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

Filesize
324KB

MD5
1c1b2ae739d84e064ddffa97668c41ca

SHA1
7826e0b0c8490ca788f89e109ddb8bf477ab808e

SHA256
30f0f65ca428044f9f221087c805a637ea5a398af056c09bfe56d07ed662ae7a

SHA512
2c5aee77640b2940ec5d0e9eaf312dafcc3df6a7a99cacc4ad9f7714a9b67df57d3645cdc2378193fd2516b7f7da79535992d6f8fb9aa1f4d9d1d043c7ae6655

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

Filesize
324KB

MD5
1c1b2ae739d84e064ddffa97668c41ca

SHA1
7826e0b0c8490ca788f89e109ddb8bf477ab808e

SHA256
30f0f65ca428044f9f221087c805a637ea5a398af056c09bfe56d07ed662ae7a

SHA512
2c5aee77640b2940ec5d0e9eaf312dafcc3df6a7a99cacc4ad9f7714a9b67df57d3645cdc2378193fd2516b7f7da79535992d6f8fb9aa1f4d9d1d043c7ae6655

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

Filesize
324KB

MD5
1c1b2ae739d84e064ddffa97668c41ca

SHA1
7826e0b0c8490ca788f89e109ddb8bf477ab808e

SHA256
30f0f65ca428044f9f221087c805a637ea5a398af056c09bfe56d07ed662ae7a

SHA512
2c5aee77640b2940ec5d0e9eaf312dafcc3df6a7a99cacc4ad9f7714a9b67df57d3645cdc2378193fd2516b7f7da79535992d6f8fb9aa1f4d9d1d043c7ae6655

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

Filesize
324KB

MD5
1c1b2ae739d84e064ddffa97668c41ca

SHA1
7826e0b0c8490ca788f89e109ddb8bf477ab808e

SHA256
30f0f65ca428044f9f221087c805a637ea5a398af056c09bfe56d07ed662ae7a

SHA512
2c5aee77640b2940ec5d0e9eaf312dafcc3df6a7a99cacc4ad9f7714a9b67df57d3645cdc2378193fd2516b7f7da79535992d6f8fb9aa1f4d9d1d043c7ae6655

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

Filesize
324KB

MD5
1c1b2ae739d84e064ddffa97668c41ca

SHA1
7826e0b0c8490ca788f89e109ddb8bf477ab808e

SHA256
30f0f65ca428044f9f221087c805a637ea5a398af056c09bfe56d07ed662ae7a

SHA512
2c5aee77640b2940ec5d0e9eaf312dafcc3df6a7a99cacc4ad9f7714a9b67df57d3645cdc2378193fd2516b7f7da79535992d6f8fb9aa1f4d9d1d043c7ae6655

Download Submit
C:\Users\Admin\AppData\Local\Temp\z78Iq5sL7E.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1028-148-0x0000000000400000-0x0000000000427000-memory.dmp

Filesize
156KB

Download
memory/1028-138-0x0000000000000000-mapping.dmp

Download
memory/1028-140-0x0000000000400000-0x0000000000427000-memory.dmp

Filesize
156KB

Download
memory/2248-139-0x0000000000000000-mapping.dmp

Download
memory/2248-158-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2248-167-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2248-141-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2568-135-0x0000000000000000-mapping.dmp

Download
memory/2568-145-0x00000000026E0000-0x00000000026E4000-memory.dmp

Filesize
16KB

Download
memory/4568-132-0x0000000000000000-mapping.dmp

Download
memory/4568-143-0x0000000000A50000-0x0000000000A54000-memory.dmp

Filesize
16KB

Download
memory/4736-160-0x0000000000000000-mapping.dmp

Download
memory/4736-161-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4736-164-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4736-165-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4736-166-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/5076-156-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5076-157-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5076-152-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5076-155-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5076-151-0x0000000000000000-mapping.dmp

Download