isrstealer | 7cb4234c1fe1bca713470e7d9525be010dce9c8fcb6b1aa768251314b8f49c57

General

Target

7cb4234c1fe1bca713470e7d9525be010dce9c8fcb6b1aa768251314b8f49c57.exe
Size

446KB
MD5

d64d05f5c5b596dbcc33d1c3c29bba36
SHA1

f7224d9219f091fcb9f44e5f6d7a39f1703e56ac
SHA256

7cb4234c1fe1bca713470e7d9525be010dce9c8fcb6b1aa768251314b8f49c57
SHA512

f935140f11d9d39f60325210472c986a6c3b9eb789124fc6e07a8b394e09726677d7b6220999030bc11dae7d823d5e871c68d0eb0a3e50996514fc7caa943e1d
SSDEEP

6144:F0c0T3+690+0yN5qnv/h4kZuNbdbCCqvN7VHD89QfulHHHvv8:F0c0K6K3SigBbCxN7VHD8yfu

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 5 IoCs

resource	yara_rule
behavioral1/memory/636-60-0x0000000000400000-0x0000000000445000-memory.dmp	family_isrstealer
behavioral1/memory/636-62-0x0000000000400000-0x0000000000445000-memory.dmp	family_isrstealer
behavioral1/memory/636-63-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral1/memory/636-78-0x0000000000400000-0x0000000000445000-memory.dmp	family_isrstealer
behavioral1/memory/636-87-0x0000000000400000-0x0000000000445000-memory.dmp	family_isrstealer

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/1616-84-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/1616-85-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/1616-86-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 3 IoCs

resource	yara_rule
behavioral1/memory/1616-84-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/1616-85-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/1616-86-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 10 IoCs

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

upx

resource	yara_rule
behavioral1/memory/872-68-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/872-72-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/872-73-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/872-74-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/872-75-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1616-79-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1616-83-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1616-84-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1616-85-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1616-86-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	vbc.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 960 set thread context of 636	960	7cb4234c1fe1bca713470e7d9525be010dce9c8fcb6b1aa768251314b8f49c57.exe	28
PID 636 set thread context of 872	636	vbc.exe	29
PID 636 set thread context of 1616	636	vbc.exe	32

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	960	7cb4234c1fe1bca713470e7d9525be010dce9c8fcb6b1aa768251314b8f49c57.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
636	vbc.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 960 wrote to memory of 636	960	7cb4234c1fe1bca713470e7d9525be010dce9c8fcb6b1aa768251314b8f49c57.exe	28
PID 960 wrote to memory of 636	960	7cb4234c1fe1bca713470e7d9525be010dce9c8fcb6b1aa768251314b8f49c57.exe	28
PID 960 wrote to memory of 636	960	7cb4234c1fe1bca713470e7d9525be010dce9c8fcb6b1aa768251314b8f49c57.exe	28
PID 960 wrote to memory of 636	960	7cb4234c1fe1bca713470e7d9525be010dce9c8fcb6b1aa768251314b8f49c57.exe	28
PID 960 wrote to memory of 636	960	7cb4234c1fe1bca713470e7d9525be010dce9c8fcb6b1aa768251314b8f49c57.exe	28
PID 960 wrote to memory of 636	960	7cb4234c1fe1bca713470e7d9525be010dce9c8fcb6b1aa768251314b8f49c57.exe	28
PID 960 wrote to memory of 636	960	7cb4234c1fe1bca713470e7d9525be010dce9c8fcb6b1aa768251314b8f49c57.exe	28
PID 960 wrote to memory of 636	960	7cb4234c1fe1bca713470e7d9525be010dce9c8fcb6b1aa768251314b8f49c57.exe	28
PID 636 wrote to memory of 872	636	vbc.exe	29
PID 636 wrote to memory of 872	636	vbc.exe	29
PID 636 wrote to memory of 872	636	vbc.exe	29
PID 636 wrote to memory of 872	636	vbc.exe	29
PID 636 wrote to memory of 872	636	vbc.exe	29
PID 636 wrote to memory of 872	636	vbc.exe	29
PID 636 wrote to memory of 872	636	vbc.exe	29
PID 636 wrote to memory of 872	636	vbc.exe	29
PID 636 wrote to memory of 872	636	vbc.exe	29
PID 636 wrote to memory of 1616	636	vbc.exe	32
PID 636 wrote to memory of 1616	636	vbc.exe	32
PID 636 wrote to memory of 1616	636	vbc.exe	32
PID 636 wrote to memory of 1616	636	vbc.exe	32
PID 636 wrote to memory of 1616	636	vbc.exe	32
PID 636 wrote to memory of 1616	636	vbc.exe	32
PID 636 wrote to memory of 1616	636	vbc.exe	32
PID 636 wrote to memory of 1616	636	vbc.exe	32
PID 636 wrote to memory of 1616	636	vbc.exe	32

C:\Users\Admin\AppData\Local\Temp\7cb4234c1fe1bca713470e7d9525be010dce9c8fcb6b1aa768251314b8f49c57.exe
"C:\Users\Admin\AppData\Local\Temp\7cb4234c1fe1bca713470e7d9525be010dce9c8fcb6b1aa768251314b8f49c57.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:960
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:636
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\A6X0w34Psz.ini"
    3⤵
    PID:872
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\WLbVr5Iz2v.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:1616

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scripting

1

T1064

Persistence

Privilege Escalation

Defense Evasion

Scripting

1

T1064

Credential Access

Discovery

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\A6X0w34Psz.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/636-87-0x0000000000400000-0x0000000000445000-memory.dmp

Filesize
276KB

Download
memory/636-78-0x0000000000400000-0x0000000000445000-memory.dmp

Filesize
276KB

Download
memory/636-57-0x0000000000400000-0x0000000000445000-memory.dmp

Filesize
276KB

Download
memory/636-58-0x0000000000400000-0x0000000000445000-memory.dmp

Filesize
276KB

Download
memory/636-60-0x0000000000400000-0x0000000000445000-memory.dmp

Filesize
276KB

Download
memory/636-62-0x0000000000400000-0x0000000000445000-memory.dmp

Filesize
276KB

Download
memory/872-73-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/872-75-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/872-68-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/872-72-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/872-74-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/960-66-0x0000000074190000-0x000000007473B000-memory.dmp

Filesize
5.7MB

Download
memory/960-54-0x0000000075F21000-0x0000000075F23000-memory.dmp

Filesize
8KB

Download
memory/960-56-0x0000000074190000-0x000000007473B000-memory.dmp

Filesize
5.7MB

Download
memory/960-55-0x0000000074190000-0x000000007473B000-memory.dmp

Filesize
5.7MB

Download
memory/1616-79-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1616-83-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1616-84-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1616-85-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1616-86-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download

Analysis

Sharing