isrstealer | 4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447

General

Target

4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe
Size

376KB
MD5

510577ca032cd0e24d889871ad787e60
SHA1

7d7a039db3bcfe6bd19f0e8024f6abf85f42f7e9
SHA256

4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447
SHA512

585f1ca45e00466d658f29f1b7656ed833f7280bf3866002a00f410f67550bf038bb95f5273bb672a5359844a27cb04acb6968cf32d9b6af59aff362fb30bbe1
SSDEEP

6144:fXgv5RyS+L5oFzU0oyeXRfcuWKNwh0Z4kXT2VX7I1tpDJhrFUhc3OVyr4:PghkVkzU0rehWKQkXCVmplhroyr

Score

10^/10

isrstealer collection 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 6 IoCs

resource	yara_rule
behavioral1/memory/1388-60-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1388-62-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1388-63-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral1/memory/1388-74-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1388-86-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1388-89-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/436-85-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/436-87-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/436-88-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 3 IoCs

resource	yara_rule
behavioral1/memory/436-85-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/436-87-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/436-88-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 10 IoCs

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

upx

resource	yara_rule
behavioral1/memory/464-69-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/464-73-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/464-75-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/464-76-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/464-77-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/436-80-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/436-84-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/436-85-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/436-87-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/436-88-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	svchost.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1468 set thread context of 1388	1468	4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe	27
PID 1388 set thread context of 464	1388	svchost.exe	28
PID 1388 set thread context of 436	1388	svchost.exe	31

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1468	4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1388	svchost.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 1468 wrote to memory of 1388	1468	4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe	27
PID 1468 wrote to memory of 1388	1468	4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe	27
PID 1468 wrote to memory of 1388	1468	4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe	27
PID 1468 wrote to memory of 1388	1468	4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe	27
PID 1468 wrote to memory of 1388	1468	4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe	27
PID 1468 wrote to memory of 1388	1468	4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe	27
PID 1468 wrote to memory of 1388	1468	4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe	27
PID 1468 wrote to memory of 1388	1468	4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe	27
PID 1388 wrote to memory of 464	1388	svchost.exe	28
PID 1388 wrote to memory of 464	1388	svchost.exe	28
PID 1388 wrote to memory of 464	1388	svchost.exe	28
PID 1388 wrote to memory of 464	1388	svchost.exe	28
PID 1388 wrote to memory of 464	1388	svchost.exe	28
PID 1388 wrote to memory of 464	1388	svchost.exe	28
PID 1388 wrote to memory of 464	1388	svchost.exe	28
PID 1388 wrote to memory of 464	1388	svchost.exe	28
PID 1388 wrote to memory of 464	1388	svchost.exe	28
PID 1388 wrote to memory of 436	1388	svchost.exe	31
PID 1388 wrote to memory of 436	1388	svchost.exe	31
PID 1388 wrote to memory of 436	1388	svchost.exe	31
PID 1388 wrote to memory of 436	1388	svchost.exe	31
PID 1388 wrote to memory of 436	1388	svchost.exe	31
PID 1388 wrote to memory of 436	1388	svchost.exe	31
PID 1388 wrote to memory of 436	1388	svchost.exe	31
PID 1388 wrote to memory of 436	1388	svchost.exe	31
PID 1388 wrote to memory of 436	1388	svchost.exe	31

C:\Users\Admin\AppData\Local\Temp\4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe
"C:\Users\Admin\AppData\Local\Temp\4b4138636d2afe18abff9cde7681abb2c6c16bdf1e21d665eb1fa7b6f6f1b447.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1468
- C:\Windows\SysWOW64\svchost.exe
  "C:\Windows\system32\svchost.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1388
- - C:\Windows\SysWOW64\svchost.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\Q4RvMJrOqJ.ini"
    3⤵
    PID:464
- - C:\Windows\SysWOW64\svchost.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\zXCCK3IEcJ.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:436

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\Q4RvMJrOqJ.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/436-80-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/436-87-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/436-85-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/436-84-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/436-88-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/464-75-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/464-77-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/464-69-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/464-73-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/464-76-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1388-62-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1388-74-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1388-60-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1388-58-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1388-57-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1388-86-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1388-89-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1468-68-0x0000000074F30000-0x00000000754DB000-memory.dmp

Filesize
5.7MB

Download
memory/1468-54-0x0000000076BA1000-0x0000000076BA3000-memory.dmp

Filesize
8KB

Download
memory/1468-56-0x0000000074F30000-0x00000000754DB000-memory.dmp

Filesize
5.7MB

Download
memory/1468-55-0x0000000074F30000-0x00000000754DB000-memory.dmp

Filesize
5.7MB

Download

Analysis

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